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[摘要]：Three new glycosides (3 beta,5 alpha,8 alpha,11 alpha 12 beta 14 beta,17 alpha,20R)-3 [(2,6 dideoxy-4-O (6-deoxy 3-O methyl-beta D allopyranosyl) 3-O methyl beta D-arabino-hexopyranosyl)oxy] 12-O-tigloyl-8,20 11,20-diepoxypregnane-12,14-diol (1), (3 beta,5 alpha,8 alpha 11 alpha,12 beta,14 beta,17 alpha,20R)-3 [(2 6-dideoxy 4-O (6-deoxy 3-O methyl-beta-D-allopyranosyl)-3-O methyl-beta-D arabino-hexopyranosyl)oxy] 12 O (2-methylbutanoyl)-8 20 11.20 diepoxypregnane 12,14-diol (2), and (3 beta 5 alpha,11 alpha,12 beta,14 beta,17 alpha)-12 acetoxy-3 [(2,6-dideoxy-4-O-(6-deoxy-3-O-methyl-beta-D-allopyranosyl)-3 O methyl beta-D-arabino-hexopyranosyl)oxy]-20-oxo-8,14-epoxypregnan-11-yl isobutyrate (3) were isolated from the stems of Marsdenia tenacissima The structures of the new compounds were elucidated by means of spectral data, including HR-ESI-MS and 1D- and 2D NMR |
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