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- [41] THE CRYSTAL-STRUCTURES OF (Z)-DIMETHYL 3-METHOXYCARBONYLMETHYL-11-METHYL-2-OXI-1,4,5,6,6A,11-HEXAHYDROFURO[2',3'-2,3]CYCLOHEXA[1,2-B]-INDOL-6A-YLFUMARATE, (E)-DIMETHYL-3-METHOXYCARBONYLMETHYL-12-METHYL-2-OXO-4,5,6,7,7A,12-HEXAHYDRO-1H-FURO[2',3'-2,3]CYCLOHEPTA-[1,2-B]INDOL-7A-YLMALEATE, AND TRIMETHYL 6-BROMO-9-METHYL-2-OXO-1,2,3,9A-TETRAHYDRO-3,9A-ETHENOCARBAZOLE-1-SPIROCYCLOPENTANE-4,10,11-TRICARBOXYLATERO JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1983, (09): : 2175 - 2180