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(4S)-6t-[tetrakis-O-(2,2,2-trichloro-ethoxycarbonyl)-β-D-glucopyranosyloxy]-4r-[(S)-2-(2,2,2-trichloro-ethoxycarbonyl)-2,3,4,9-tetrahydro-1H-β-carbolin-1-ylmethyl]-5c-vinyl-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester