CC(=O)Oc1c2c(c(OC(C)=O)c3c1n(C(C)=O)c1ccccc1n3C(C)=O)n(C(C)=O)c1ccccc1n2C(C)=O
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?