Nc1ccc(-c2nnc(-c3c(Cl)c(Cl)c(Cl)c(Cl)c3-c3nc4cc(C(=O)c5ccccc5)ccc4[nH]3)o2)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?