Nc1ncnc2c1nc(Sc1ccc(Cl)cc1)n2[C@H]1O[C@@H]2CO[P@@](=O)([O-])O[C@H]2[C@@H]1O.[Na+]
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?