COc1cc([N+](=O)[O-])c(S(=O)(=O)[O-])cc1-n1nc(-c2ccccc2)n[n+]1-c1cc(S(=O)(=O)[O-])c([N+](=O)[O-])cc1OC.[Na+]
Heavy atom refers to any atom that is not hydrogen. How many heavy atoms do the molecule have?