CC(=O)OC1COC(N2C(=O)/C(=N\Nc3ccc([N+](=O)[O-])cc3)c3cc(Br)c([N+](=O)[O-])cc32)C(OC(C)=O)C1OC(C)=O
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?