CC1=CC2C3(C)C(C)(C(C)=CP3(=O)c3c(C(C)C)cc(C(C)C)cc3C(C)C)C1P2(=O)c1c(C(C)C)cc(C(C)C)cc1C(C)C
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?