CSc1nc(NC2OCC(OC(C)=O)C(OC(C)=O)C2OC(C)=O)c(/N=C(\C)C(C)=O)c(=O)[nH]1
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?