O=C(COc1ccc(OCC(=O)N/N=C/c2ccc(-c3ccc(Cl)cc3Cl)o2)c(Cl)c1)N/N=C/c1ccc(-c2ccc(Cl)cc2Cl)o1
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?