New Acylated Secoiridoid Glucosides from Gentiana straminea (Gentianaceae)

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Abstract
Magnified image Two new acylated secoiridoid glucosides, 4′‐acetyl‐6′‐{[2‐hydroxy‐3‐(1‐β‐D‐glucopyranosyloxy)]benzoyloxy}sweroside and 3′,4′‐diacetyl‐6′‐{[2‐hydroxy‐3‐(1‐β‐D‐glucopyranosyloxy)]benzoyloxy}swertiamarin, named gentistraminosides A (1) and B (2), were isolated from the MeOH extract of Gentiana straminea Maxim (Gentianaceae), together with twelve known ones, including eight iridoid and secoiridoid glucosides, macrophylloside A (3), loganic acid (4), secologanic acid (5), swertiamarin (6), gentiopicroside (7), loganic acid methyl ester (8), 6′‐O‐β‐D‐glucopyranosyl gentiopicroside (9), and loganic acid 11‐O‐β‐D‐glucopyranosyl ester (10), one flavone C‐glucoside, isovitexin (11), one chromenecarboxylic acid glycosyl ester, macrophylloside D (12), and two triterpenoids, 1α,2α,3β,24‐tetrahydroxyolean‐12‐en‐28‐oic acid (13), and 3β,6α,24‐trihydroxyolean‐12‐en‐28‐oic acid (14). Their structures were determined by means of detailed spectroscopic (NMR and MS) analysis.

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