O=C(Nc1ccc(N2C(=O)c3cccc4cccc(c34)C2=O)cc1)c1ccc(N2CCCCC2)c([N+](=O)[O-])c1
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?