Study on identification of iridoid glucosides from Lagotis yunnanensis

OBJECTIVE To study the chemical constituents of Lagotis yunnanesis. METHODS The compounds were isolated by silica column chromatography,and the structures were elucidated by spectral methods. RESULTS Four iridoid glucosides were isolated and identified as 10-O-(E)-p-methoxycinmamoyl-catalpol (Ⅰ), 10-O-(Z)-p-methoxycinmamoyl-catalpol (Ⅱ), 6-O-(E)-3″,4″-methoxy-cinmamoyl- catalpol (Ⅲ) and 6-O-(Z)-3″,4″-methoxycinmamoyl-catalpol (Ⅳ). CONCLUSION All compounds were isolated from this plant forthe first time.