O=C(C1=C(O)C(=O)N(CCN2CCOCC2)C1c1ccc(Cl)cc1)c1ccc(S(=O)(=O)N2CCOCC2)cc1
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?