COc1ccc(-c2ccc3[nH]c4c(c3c2)CCN2C(=O)[C@@H]([C@H](C)O)[C@@H](N(C)C(=O)Nc3ccccc3)C[C@@H]42)cc1
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?