C=C(C)C(=O)O[C@H]1C/C(CO)=C/CCC(=C)C(OC(C)=O)[C@H]2OC(=O)C(=C)[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?