COc1ccc(C(=O)OCC2OC(n3cnc4c(=S)nc[nH]c43)C(OC(=O)c3ccc(OC)cc3)C2OC(=O)c2ccc(OC)cc2)cc1
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?