COC(=O)/C(=N\NC(N)=O)C(C(=O)C(=O)Nc1ccccc1C(=O)OC)c1nc2ccc(C(=O)c3ccccc3)cc2nc1O
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?