CNC1C(O)[C@@H]2OC(O[C@@H]3C(O)C(O)C(N)C[C@H]3N)C(N)C[C@H]2O[C@H]1O[C@@H]1OC(CO)C(N)C(O)C1O
Heavy atom refers to any atom that is not hydrogen. The heavy atoms in molecules are carbon, oxygen, nitrogen, and sulfur. How many heavy atoms are in the molecule?