COC(=O)C1=C(C(=O)OC)[C@@H]2N(Cc3ccccc3)c3ccccc3[C@@]23C[C@@H](C(=O)OC)N(C(=O)c2cccs2)C3=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?