O=C(Nc1ccccc1)c1cc(S(=O)(=O)Nc2n[nH]c(=O)[nH]2)c(SSc2cc(Cl)c(C(=O)Nc3ccccc3)cc2S(=O)(=O)Nc2n[nH]c(=O)[nH]2)cc1Cl
Heavy atom refers to any atom that is not hydrogen. How many heavy atoms do the molecule have?