N-甲基马来酰亚胺 、
(2E,4E)-5-((3aS,4R,7aR)-2-Methyl-1,3-dioxo-2,3,3a,4,7,7a-hexahydro-1H-isoindol-4-yl)-penta-2,4-dienoic acid methyl ester 生成 (3'aR,4'S,7'aS)-2,2'-Dimethyl-1,3,1',3'-tetraoxo-2,3,3a,4,7,7a,2',3',3'a,4',7',7'a-dodecahydro-1H,1'H-[4,4']biisoindolyl-7-carboxylic acid methyl ester