C=CCN1c2ccccc2[C@]23C[C@@H](C(=O)OC)N(C(=O)c4ccc(Br)cc4)C2=NC(C(=O)OC)=C(C(=O)OC)[C@H]13
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?