COC(=O)C[C@H]1c2ccccc2C2=C(C[C@@H](C)[C@H]3C(=O)N(c4ccccc4)C(=O)[C@@H]23)N1C(=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?