155592-98-6 4,5-Dihydro-3-(phenylmethylene)-1,4,5-triphenylpyrrolo(3,4-b)pyrrole-2,6(1H,3H)-dione Pyrrolo(3,4-b)pyrrole-2,6(1H,3H)-dione, 4,5-dihydro-3-(phenylmethylene)-1,4,5-triphenyl-