CC(=O)Oc1cc(-c2coc3cc(OC(C)=O)c(OC(C)=O)c(OC(C)=O)c3c2=O)cc(OC(C)=O)c1OC(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?