COCC1=C2c3ccccc3[C@H](C[N+](=O)[O-])C(C(=O)OC)(C(=O)OC)C[C@@H]2n2c(=O)n(-c3ccccc3)c(=O)n2C1
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?