O=C1[C@H]2[C@H]3C[C@@H]([C@H]2C(=O)N1c1ccc2c(c1)OCO2)[C@@H]1C(c2ccc(OCc4ccccc4)cc2)=NO[C@H]31
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?