CCC1=C2CC[C@H]3C(=O)N(CC(=O)OC)C(=O)[C@H]3[C@H]2[C@@]2(C)C(=O)N(CC3CC3)C(=O)N2C1=O
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?