(1,1'-Biphenyl)-ar,ar'-disulfonic acid, compd. with 1-(2-(diethylamino)ethyl)-1H-pyrrole-2,5-dione 1-(2-(Diethylamino)ethyl)-1H-pyrrole-2,5-dione (1,1'-biphenyl)-ar,ar'-disulfonate 1H-Pyrrole-2,5-dione, 1-(2-(diethylamino)ethyl)-, (1,1'-biphenyl)-ar,ar'-disulfonate 39723-64-3