[N-]=[N+]=Nc1ccc(S(=O)(=O)Oc2cc(OS(=O)(=O)c3ccc(N=[N+]=[N-])cc3)cc(OS(=O)(=O)c3ccc(N=[N+]=[N-])cc3)c2)cc1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?