C[C@@]12C(=O)N(c3cccc(Br)c3)C(=O)N1[C@H](c1ccc(Cl)cc1)[C@@H]1C(=O)N(C3CCCCC3)C(=O)[C@@H]12
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?