COC1=C(N)C(=O)C2=C(CCC(c3nc(C(=O)O)c(C)c(-c4ccc(OC)c(OC)c4O)c3N)N2)C1=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?