O=[N+]([O-])c1ccc(S[C@H]2[C@H]3C[C@@H](Cl)[C@@H]2c2c(-c4ccccc4)[nH]c(-c4ccccc4)c23)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?