COc1ccc(Cl)cc1NC(=O)Cn1c(=O)n(-c2ccc(C)cc2)c(=O)c2ccc(C(=O)NCc3ccccc3Cl)cc21
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?