O=C(CC(=O)N(C(=O)/C=C\c1ccccc1)c1ccc(Cl)cc1)N1N=C(c2ccccc2)C(/N=N/c2cccc([N+](=O)[O-])c2)C1=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?