COC(=O)C1=CC2C=CC(C1C(=O)OC)C1C(C(=O)OC)=C(C(=O)OC)C(C(=O)OC)=C(C(=O)OC)C21OC
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?