CC1(C)C(O)CC(=O)[C@]2(C)C1CC(=O)[C@]1(C)C2CC[C@@]2(C)C(c3ccoc3)OC(=O)C3O[C@@]321
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?