CC1(C)C(=O)C=C[C@@]2(C)C1C=C[C@@]1(C)C2CC[C@@]2(C)C(c3ccoc3)OC(=O)C3OC312
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?