CC1=C(C(=O)OCCO[N+](=O)[O-])C(c2cccc([N+](=O)[O-])c2)C(C(=O)OC(C)C)=C(C)N1
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?