Nc1c(/N=N/c2ccc(S(=O)(=O)CCOS(=O)(=O)[O-])cc2)c(S(=O)(=O)[O-])cc2cc(S(=O)(=O)[O-])c(/N=N/c3ccc(S(=O)(=O)CCOS(=O)(=O)[O-])cc3)c(O)c12.[Na+].[Na+].[Na+].[Na+]
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?