O=C1c2c(O)cc(O)cc2O[C@@]12c1c(cc(O)c3c1O[C@H](c1ccc(O)cc1)[C@@H](O)C3)O[C@@H]2c1ccc(O)cc1
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?