LiCuCO3 crystallizes in the triclinic P1 space group. There are nine inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(7), and two equivalent O(1) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Cu(3)O4 trigonal pyramids, and corners with two equivalent Cu(6)O4 trigonal pyramids. In the second Li site, Li(2) is bonded to one O(25), one O(6), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra and corners with two equivalent Cu(8)O5 trigonal bipyramids. In the third Li site, Li(3) is bonded to one O(27), one O(4), and two equivalent O(9) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Cu(3)O4 trigonal pyramids, and corners with two equivalent Cu(9)O4 trigonal pyramids. In the fourth Li site, Li(4) is bonded to one O(19), one O(5), and two equivalent O(11) atoms to form corner-sharing LiO4 tetrahedra. In the fifth Li site, Li(5) is bonded to one O(16), one O(8), and two equivalent O(10) atoms to form corner-sharing LiO4 tetrahedra. In the sixth Li site, Li(6) is bonded to one O(15), one O(17), and two equivalent O(12) atoms to form LiO4 trigonal pyramids that share  a cornercorner with one Cu(3)O4 trigonal pyramid and corners with two equivalent Li(6)O4 trigonal pyramids. In the seventh Li site, Li(7) is bonded to one O(14), one O(20), and two equivalent O(13) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Cu(6)O4 trigonal pyramids, and corners with two equivalent Cu(9)O4 trigonal pyramids. In the eighth Li site, Li(8) is bonded to one O(18), one O(22), and two equivalent O(23) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(8)O4 tetrahedra,  a cornercorner with one Cu(6)O4 trigonal pyramid, and edges with two equivalent Cu(8)O5 trigonal bipyramids. In the ninth Li site, Li(9) is bonded to one O(21), one O(26), and two equivalent O(24) atoms to form LiO4 trigonal pyramids that share  a cornercorner with one Cu(9)O4 trigonal pyramid and corners with two equivalent Li(9)O4 trigonal pyramids. There are nine inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(5) atoms. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(10), one O(4), and two equivalent O(6) atoms. In the third Cu site, Cu(3) is bonded to one O(15), one O(9), and two equivalent O(7) atoms to form distorted CuO4 trigonal pyramids that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra,  a cornercorner with one Li(6)O4 trigonal pyramid, and corners with two equivalent Cu(3)O4 trigonal pyramids. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one O(11), two equivalent O(14), and two equivalent O(8) atoms. In the fifth Cu site, Cu(5) is bonded in a 5-coordinate geometry to one O(12), two equivalent O(16), and two equivalent O(17) atoms. In the sixth Cu site, Cu(6) is bonded to one O(1), one O(18), and two equivalent O(20) atoms to form distorted CuO4 trigonal pyramids that share  a cornercorner with one Li(8)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, and corners with two equivalent Cu(6)O4 trigonal pyramids. In the seventh Cu site, Cu(7) is bonded in a 5-coordinate geometry to one O(24), two equivalent O(19), and two equivalent O(21) atoms. In the eighth Cu site, Cu(8) is bonded to one O(23), two equivalent O(22), and two equivalent O(25) atoms to form distorted CuO5 trigonal bipyramids that share corners with two equivalent Li(2)O4 tetrahedra, edges with two equivalent Li(8)O4 tetrahedra, and edges with two equivalent Cu(8)O5 trigonal bipyramids. In the ninth Cu site, Cu(9) is bonded to one O(13), one O(26), and two equivalent O(27) atoms to form distorted CuO4 trigonal pyramids that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra,  a cornercorner with one Li(9)O4 trigonal pyramid, and corners with two equivalent Cu(9)O4 trigonal pyramids. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(23) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(20), one O(27), and one O(7) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(5), one O(6), and one O(8) atom. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(10), one O(12), and one O(9) atom. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one O(11), one O(13), and one O(24) atom. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one O(14), one O(16), and one O(18) atom. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one O(15), one O(19), and one O(3) atom. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one O(17), one O(21), and one O(22) atom. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one O(25), one O(26), and one O(4) atom. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Cu(6), and one C(1) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the second O site, O(2) is bonded to two equivalent Li(2), one Cu(1), and one C(1) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Cu(1), and one C(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(3), one Cu(2), and one C(9) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Li(4), two equivalent Cu(1), and one C(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Li(2), two equivalent Cu(2), and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), two equivalent Cu(3), and one C(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Li(5), two equivalent Cu(4), and one C(3) atom. In the ninth O site, O(9) is bonded to two equivalent Li(3), one Cu(3), and one C(4) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Li(5), one Cu(2), and one C(4) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Li(4), one Cu(4), and one C(5) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Li(6), one Cu(5), and one C(4) atom. In the thirteenth O site, O(13) is bonded to two equivalent Li(7), one Cu(9), and one C(5) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Li(7), two equivalent Cu(4), and one C(6) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Li(6), one Cu(3), and one C(7) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Li(5), two equivalent Cu(5), and one C(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Li(6), two equivalent Cu(5), and one C(8) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Li(8), one Cu(6), and one C(6) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Li(4), two equivalent Cu(7), and one C(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Li(7), two equivalent Cu(6), and one C(2) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Li(9), two equivalent Cu(7), and one C(8) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Li(8), two equivalent Cu(8), and one C(8) atom. In the twenty-third O site, O(23) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(8), one Cu(8), and one C(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(9), one Cu(7), and one C(5) atom. In the twenty-fifth O site, O(25) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), two equivalent Cu(8), and one C(9) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Li(9), one Cu(9), and one C(9) atom. In the twenty-seventh O site, O(27) is bonded in a distorted rectangular see-saw-like geometry to one Li(3), two equivalent Cu(9), and one C(2) atom.
LiCuCO3 crystallizes in the triclinic P1 space group. There are nine inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(7), and two equivalent O(1) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Cu(3)O4 trigonal pyramids, and corners with two equivalent Cu(6)O4 trigonal pyramids. The Li(1)-O(3) bond length is 1.97 Å. The Li(1)-O(7) bond length is 1.98 Å. There is one shorter (2.02 Å) and one longer (2.08 Å) Li(1)-O(1) bond length. In the second Li site, Li(2) is bonded to one O(25), one O(6), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra and corners with two equivalent Cu(8)O5 trigonal bipyramids. The Li(2)-O(25) bond length is 2.00 Å. The Li(2)-O(6) bond length is 1.95 Å. There is one shorter (2.02 Å) and one longer (2.09 Å) Li(2)-O(2) bond length. In the third Li site, Li(3) is bonded to one O(27), one O(4), and two equivalent O(9) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Cu(3)O4 trigonal pyramids, and corners with two equivalent Cu(9)O4 trigonal pyramids. The Li(3)-O(27) bond length is 1.95 Å. The Li(3)-O(4) bond length is 1.96 Å. Both Li(3)-O(9) bond lengths are 2.02 Å. In the fourth Li site, Li(4) is bonded to one O(19), one O(5), and two equivalent O(11) atoms to form corner-sharing LiO4 tetrahedra. The Li(4)-O(19) bond length is 1.99 Å. The Li(4)-O(5) bond length is 1.99 Å. There is one shorter (2.06 Å) and one longer (2.07 Å) Li(4)-O(11) bond length. In the fifth Li site, Li(5) is bonded to one O(16), one O(8), and two equivalent O(10) atoms to form corner-sharing LiO4 tetrahedra. The Li(5)-O(16) bond length is 2.02 Å. The Li(5)-O(8) bond length is 1.93 Å. There is one shorter (2.03 Å) and one longer (2.10 Å) Li(5)-O(10) bond length. In the sixth Li site, Li(6) is bonded to one O(15), one O(17), and two equivalent O(12) atoms to form LiO4 trigonal pyramids that share  a cornercorner with one Cu(3)O4 trigonal pyramid and corners with two equivalent Li(6)O4 trigonal pyramids. The Li(6)-O(15) bond length is 2.00 Å. The Li(6)-O(17) bond length is 1.94 Å. There is one shorter (2.03 Å) and one longer (2.05 Å) Li(6)-O(12) bond length. In the seventh Li site, Li(7) is bonded to one O(14), one O(20), and two equivalent O(13) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Cu(6)O4 trigonal pyramids, and corners with two equivalent Cu(9)O4 trigonal pyramids. The Li(7)-O(14) bond length is 1.94 Å. The Li(7)-O(20) bond length is 1.93 Å. There is one shorter (2.00 Å) and one longer (2.02 Å) Li(7)-O(13) bond length. In the eighth Li site, Li(8) is bonded to one O(18), one O(22), and two equivalent O(23) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(8)O4 tetrahedra,  a cornercorner with one Cu(6)O4 trigonal pyramid, and edges with two equivalent Cu(8)O5 trigonal bipyramids. The Li(8)-O(18) bond length is 1.97 Å. The Li(8)-O(22) bond length is 1.97 Å. Both Li(8)-O(23) bond lengths are 2.03 Å. In the ninth Li site, Li(9) is bonded to one O(21), one O(26), and two equivalent O(24) atoms to form LiO4 trigonal pyramids that share  a cornercorner with one Cu(9)O4 trigonal pyramid and corners with two equivalent Li(9)O4 trigonal pyramids. The Li(9)-O(21) bond length is 1.97 Å. The Li(9)-O(26) bond length is 1.97 Å. There is one shorter (2.04 Å) and one longer (2.05 Å) Li(9)-O(24) bond length. There are nine inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(5) atoms. The Cu(1)-O(2) bond length is 2.17 Å. The Cu(1)-O(3) bond length is 1.97 Å. There is one shorter (1.98 Å) and one longer (2.52 Å) Cu(1)-O(5) bond length. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(10), one O(4), and two equivalent O(6) atoms. The Cu(2)-O(10) bond length is 2.17 Å. The Cu(2)-O(4) bond length is 1.97 Å. There is one shorter (1.99 Å) and one longer (2.54 Å) Cu(2)-O(6) bond length. In the third Cu site, Cu(3) is bonded to one O(15), one O(9), and two equivalent O(7) atoms to form distorted CuO4 trigonal pyramids that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra,  a cornercorner with one Li(6)O4 trigonal pyramid, and corners with two equivalent Cu(3)O4 trigonal pyramids. The Cu(3)-O(15) bond length is 2.01 Å. The Cu(3)-O(9) bond length is 2.18 Å. There is one shorter (2.08 Å) and one longer (2.37 Å) Cu(3)-O(7) bond length. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one O(11), two equivalent O(14), and two equivalent O(8) atoms. The Cu(4)-O(11) bond length is 2.16 Å. There is one shorter (2.04 Å) and one longer (2.56 Å) Cu(4)-O(14) bond length. There is one shorter (2.09 Å) and one longer (2.43 Å) Cu(4)-O(8) bond length. In the fifth Cu site, Cu(5) is bonded in a 5-coordinate geometry to one O(12), two equivalent O(16), and two equivalent O(17) atoms. The Cu(5)-O(12) bond length is 2.28 Å. There is one shorter (1.96 Å) and one longer (2.40 Å) Cu(5)-O(16) bond length. There is one shorter (1.98 Å) and one longer (2.62 Å) Cu(5)-O(17) bond length. In the sixth Cu site, Cu(6) is bonded to one O(1), one O(18), and two equivalent O(20) atoms to form distorted CuO4 trigonal pyramids that share  a cornercorner with one Li(8)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, and corners with two equivalent Cu(6)O4 trigonal pyramids. The Cu(6)-O(1) bond length is 2.19 Å. The Cu(6)-O(18) bond length is 1.99 Å. There is one shorter (2.02 Å) and one longer (2.44 Å) Cu(6)-O(20) bond length. In the seventh Cu site, Cu(7) is bonded in a 5-coordinate geometry to one O(24), two equivalent O(19), and two equivalent O(21) atoms. The Cu(7)-O(24) bond length is 2.33 Å. There is one shorter (1.94 Å) and one longer (2.55 Å) Cu(7)-O(19) bond length. There is one shorter (1.94 Å) and one longer (2.58 Å) Cu(7)-O(21) bond length. In the eighth Cu site, Cu(8) is bonded to one O(23), two equivalent O(22), and two equivalent O(25) atoms to form distorted CuO5 trigonal bipyramids that share corners with two equivalent Li(2)O4 tetrahedra, edges with two equivalent Li(8)O4 tetrahedra, and edges with two equivalent Cu(8)O5 trigonal bipyramids. The Cu(8)-O(23) bond length is 2.25 Å. There is one shorter (2.16 Å) and one longer (2.28 Å) Cu(8)-O(22) bond length. There is one shorter (2.10 Å) and one longer (2.26 Å) Cu(8)-O(25) bond length. In the ninth Cu site, Cu(9) is bonded to one O(13), one O(26), and two equivalent O(27) atoms to form distorted CuO4 trigonal pyramids that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra,  a cornercorner with one Li(9)O4 trigonal pyramid, and corners with two equivalent Cu(9)O4 trigonal pyramids. The Cu(9)-O(13) bond length is 2.20 Å. The Cu(9)-O(26) bond length is 1.97 Å. There is one shorter (2.02 Å) and one longer (2.43 Å) Cu(9)-O(27) bond length. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(23) atom. The C(1)-O(1) bond length is 1.30 Å. The C(1)-O(2) bond length is 1.30 Å. The C(1)-O(23) bond length is 1.29 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(20), one O(27), and one O(7) atom. The C(2)-O(20) bond length is 1.30 Å. The C(2)-O(27) bond length is 1.30 Å. The C(2)-O(7) bond length is 1.30 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(5), one O(6), and one O(8) atom. The C(3)-O(5) bond length is 1.30 Å. The C(3)-O(6) bond length is 1.30 Å. The C(3)-O(8) bond length is 1.30 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(10), one O(12), and one O(9) atom. The C(4)-O(10) bond length is 1.31 Å. The C(4)-O(12) bond length is 1.29 Å. The C(4)-O(9) bond length is 1.30 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one O(11), one O(13), and one O(24) atom. The C(5)-O(11) bond length is 1.31 Å. The C(5)-O(13) bond length is 1.30 Å. The C(5)-O(24) bond length is 1.29 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one O(14), one O(16), and one O(18) atom. The C(6)-O(14) bond length is 1.30 Å. The C(6)-O(16) bond length is 1.31 Å. The C(6)-O(18) bond length is 1.30 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one O(15), one O(19), and one O(3) atom. The C(7)-O(15) bond length is 1.30 Å. The C(7)-O(19) bond length is 1.31 Å. The C(7)-O(3) bond length is 1.30 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one O(17), one O(21), and one O(22) atom. The C(8)-O(17) bond length is 1.29 Å. The C(8)-O(21) bond length is 1.30 Å. The C(8)-O(22) bond length is 1.30 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one O(25), one O(26), and one O(4) atom. The C(9)-O(25) bond length is 1.31 Å. The C(9)-O(26) bond length is 1.30 Å. The C(9)-O(4) bond length is 1.30 Å. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Cu(6), and one C(1) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the second O site, O(2) is bonded to two equivalent Li(2), one Cu(1), and one C(1) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Cu(1), and one C(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(3), one Cu(2), and one C(9) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Li(4), two equivalent Cu(1), and one C(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Li(2), two equivalent Cu(2), and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), two equivalent Cu(3), and one C(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Li(5), two equivalent Cu(4), and one C(3) atom. In the ninth O site, O(9) is bonded to two equivalent Li(3), one Cu(3), and one C(4) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Li(5), one Cu(2), and one C(4) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Li(4), one Cu(4), and one C(5) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Li(6), one Cu(5), and one C(4) atom. In the thirteenth O site, O(13) is bonded to two equivalent Li(7), one Cu(9), and one C(5) atom to form distorted corner-sharing OLi2CuC tetrahedra. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Li(7), two equivalent Cu(4), and one C(6) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Li(6), one Cu(3), and one C(7) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Li(5), two equivalent Cu(5), and one C(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Li(6), two equivalent Cu(5), and one C(8) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Li(8), one Cu(6), and one C(6) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Li(4), two equivalent Cu(7), and one C(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Li(7), two equivalent Cu(6), and one C(2) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Li(9), two equivalent Cu(7), and one C(8) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Li(8), two equivalent Cu(8), and one C(8) atom. In the twenty-third O site, O(23) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(8), one Cu(8), and one C(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(9), one Cu(7), and one C(5) atom. In the twenty-fifth O site, O(25) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), two equivalent Cu(8), and one C(9) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Li(9), one Cu(9), and one C(9) atom. In the twenty-seventh O site, O(27) is bonded in a distorted rectangular see-saw-like geometry to one Li(3), two equivalent Cu(9), and one C(2) atom.