Five new iridoid glycosides were isolated by chromatographic separation of extracts from the roots of three Gentiana species (Gentianaceae) growing in Eastern Siberia. Their structures were elucidated by spectral methods as 2′-O-(2′′-hydroxy-3′′ -O-β-D-glucopyranosyloxybenzoyl)swertiamarin (gentiridoid A), 2′-O-(2′′-hydroxy-3′′-O-β-D-glucopyranosyloxybenzoyl)gentiopicroside (gentiridoid B), and 3′,6′-di-Oacetyl-4′-O-(2′′,3′′-dihydroxybenzoyl)swertiamarin (gentiridoid C) from G. decumbens L. f.; 2′,3′,6′-tri-Oacetyl-4′-O-[2′′-hydroxy-3′′-O-(6′′′-O-β-D-glucopyranosyl)-β-D-glucopyranosyloxybenzoyl]swertiamarin (gentiridoid D) from G. dahurica Fisch.; and loganic acid 6′-O-(6′′ -O-β-D-glucopyranosyl)-β-Dglucopyranoside (gentiridoid E) from G. macrophylla Pall.

通过色谱分离生长在东西伯利亚的三种龙胆属（龙胆科）的根提取物，分离出了五种新的环烯醚萜苷。它们的结构通过光谱方法阐明为 2'- O -(2''-羟基-3'' - O - β -D-吡喃葡萄糖基氧基苯甲酰基) swertiamarin (gentiridoid A), 2'- O -(2''-hydroxy- 3''- O - β -D-吡喃葡萄糖基氧基苯甲酰基）龙胆苦苷（gentiridoid B），和 3',6'-di-Oacetyl-4'- O -（2'',3''-dihydroxybenzoyl）swertiamarin（gentiridoid C）来自 G. decumbens L. f.；2'，3'，6'-三- O-乙酰基-4' - ö - [2' -羟基-3'' - Ö - （6''' - ö - β-D-吡喃葡萄糖基)- β -D-吡喃葡萄糖基氧基苯甲酰基]swertiamarin (gentiridoid D)，来自 G. dahurica Fisch.；和来自 G. macrophylla Pall 的6'- O -(6'' - O - β -D-吡喃葡萄糖基)- β -D-吡喃葡萄糖苷(gentiridoid E)。