Methyl (1'S,2S,4a'S,5a'S,10a'S)-5,6-dimethoxy-1'-methyl-3-oxo-1,3,5',5a',7',8',10',10a'-octahydro-1'H,4a'H-spiro[indole-2,6'-pyrano[3,4-f]indolizine]-4'-carboxylate;spiro[2H-indole-2,6'(10'H)-[1H]pyrano[3,4-f]indolizine]-4'-carboxylic acid, 1,3,4'a,5',5'a,7',8',10'a-octahydro-5,6-dimethoxy-1'-methyl-3-oxo-, methyl ester, (1'S,2S,4a'S,5a'S,10a'S)-
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