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A new alkaloid, tournesibirin ( 1 ), was isolated from the dichloromethane extracts from  Tournefortia sibirica  L. The structure of  1  was determined by spectroscopic methods, including UV, IR, HR-ESI-MS and extensive 1D and 2D NMR techniques.

Structural elucidation of a new alkaloid from Tournefortia sibirica L.