(1,1'-Biphenyl)-ar,ar'-disulfonic acid, compd. with 1-(3-(dimethylamino)propyl)-1H-pyrrole-2,5-dione 1H-Pyrrole-2,5-dione, 1-(3-(dimethylamino)propyl)-, (1,1'-biphenyl)-ar,ar'-disulfonate 39723-66-5