COc1nc2c(c(O)c(C)c(=O)n2OC2OCC(OC(C)=O)C(OC(C)=O)C2OC(C)=O)c(=O)n1C
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?