COc1cc(C(c2c(C)n[nH]c2O)c2c(C)n[nH]c2O)ccc1OC(=O)c1cccc([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?