1H-isoindole-1,3(2H)-dione, 2-[4-(acetyloxy)-2-cyclopenten-1-yl]- 4-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)cyclopent-2-en-1-yl acetate InChI=1/C21H17N3O3/c25-20-14-6-1-2-7-15(14)21(26)24(20)18-11-17-19-13(9-10-23(17)27-18)12-5-3-4-8-16(12)22-19/h1-8,17-18,22H,9-11H