O=C1[C@@H]2CN3CN(c4ccccc4)N=C(c4ccccc4)[C@@]3(c3ccccc3)[C@@H]2C(=O)N1c1ccccc1
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?