COC(=O)C1=C(O)C(C(=O)OC)[C@@]2(O)[C@@H](C(=O)OC)[C@H](C)[C@@H](C)[C@@H]1[C@@H]2C(=O)OC
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?