COC(=O)/C=C(/C=C1/C(C#N)=C(N)N(c2ccc(Cl)cc2)C1(C)/C(=C/C(=O)OC)C(=O)OC)C(=O)OC
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?