From the whole plant of Corydalis thyrsiflora Prain, an herbal medicine used in Tibet, 12 isoquinoline alkaloids were isolated and identified as protopine, dl-tetrahydrocoptisine, l-sinactine, l-cavidine, d-bicuculline, d-corlumine, sibiricine, ochotensine, dihydrosanguinarine,
OBJECTIVE
To study the alkaloids from Corydalis impatiens.
METHODS
The alkaloids were isolated and purified by chromatography and their structures were identified by spectral data and others methods.
RESULTS
Seven alkaloids were isolated and identified as bicuculline(1), ochotensine(2),