CCOC(=O)C1=C[C@@H](C(C)(C)C)N(S(=O)(=O)c2ccc(C)cc2)[C@H]1c1ccc(Cl)c(Cl)c1
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?