C=C(C)C(=O)Nc1cccc(C2=NOC3(C2)C[C@H](C(N)=O)N(C(=O)C(c2ccccc2)c2ccccc2)C3)c1
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?