O=C(c1ccc2c(c1)OCO2)[C@@H]1[C@@H]2C(=O)N(C3CCCCC3)C(=O)[C@@H]2C2c3ccccc3C=CN21
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?