38492-17-0 4,8-Ethenopyrrolo(3',4':3,4)cyclobut(1,2-f)isoindole-2,6-dihexanoic acid, 1,3,3a,3b,4,4a,5,7,7a,8,8a,8b-dodecahydro-1,3,5,7-tetraoxo- BRN 0735444 Tricyclodecenetetracarboxy-N,N'-bis-(5-carboxypentyl)imide