O=C(OCC1OC(n2nc(Cn3nnc(-c4cccnc4)n3)n(-c3cccc4ccccc34)c2=S)C(OC(=O)c2ccccc2)C1OC(=O)c1ccccc1)c1ccccc1
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?