1,1'-(Sulphonyldi-3,1-phenylene)bis-1H-pyrrole-2,5-dione 193157-99-2 1H-Pyrrole-2,5-dione, 1,1'-(sulfonyldi-3,1-phenylene)bis- 3,3'-Bismaleimidodiphenyl sulfone 68555-55-5 EINECS 271-431-1