O=C1[C@@H]2Cc3c([nH]c4ccccc34)[C@@H](c3ccccc3)N2C(=O)[C@@H]2Cc3c([nH]c4ccccc34)[C@@H](c3ccccc3)N12
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?