O=C(Nc1ccc2[nH]c(C(=O)N3CC(CCl)c4c3cc([N+](=O)[O-])c3ccccc43)cc2c1)Nc1ccc2[nH]c(C(=O)N3CC(CCl)c4c3cc([N+](=O)[O-])c3ccccc43)cc2c1
All atoms other than hydrogen are referred to be heavy atoms. How many heavy atoms are there in the molecule?