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(4Ar)-3-Isopropyl-4-formyl-7beta-methyl-8a-(3-O,4-O-carbonyl-2,6-dideoxy-beta-D-ribo-hexopyranosyloxymethyl)-1,4-methano-1,3a,4,4abeta,5,6,7,7aalpha,8,8a-decahydro-s-indacene-3a-carboxylic acid


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