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methyl (3aS,3a1R,4R,5S,5aR,10bS)-4-(benzyloxy)-3a-ethyl-8-methoxy-6-methyl-1-oxo-2,3,3a,4,5a,6,11,12-octahydro-3a1,5-epoxyindolizino[8,1-cd]carbazole-5(1H)-carboxylate
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methyl (2R,3aR,3a1S,4S,5R,5aS,10bR)-3a-ethyl-4-hydroxy-8-methoxy-6-methyl-2-((triisopropylsilyl)oxy)-2,3,3a,4,5a,6,11,12-octahydro-3a1,5-epoxyindolizino[8,1-cd]carbazole-5(1H)-carboxylate
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(2R,3aS,4S,5R,5aS,10bS,12bS)-4-Acetoxy-3a-ethyl-5-hydroxy-8-methoxy-6-methyl-2-triisopropylsilanyloxy-2,3,3a,4,5,5a,6,11,12,12b-decahydro-1H-6,12a-diaza-indeno[7,1-cd]fluorene-5-carboxylic acid methyl ester
