CC(C)(C)NC(=O)C[C@H]1C[C@H](C(=O)N2CCOCC2)[C@@]2(C)c3[nH]c4ccc(Cl)cc4c3CCN2C1=O
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?