CCCCCc1c2nc(c(CCCCC)c3ccc([nH]3)c(CCCCC)c3nc(c(CCCCC)c4ccc1[nH]4)C=C3)C=C2
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?