A new lupine alkaloid, (—)-0-acetylbaptifoline [3], was isolated from the roots of Thermopsis chinensis together with seven known (—)-anagyrine-type (7R,9R, 11R) alkaloids. The structure of 3 was confirmed by spectroscopic methods and by chemical transformations. We also isolated (+)-lupanine [9] and (—)-sparteine [10] (6R,7S,9S, 11S) from this plant. These results indicate that T. chinensis has the biosynthetic ability to biosynthesize both (7R,9R, 11R) and (7S,9S,11S) alkaloids. © 1989, American Chemical Society. All rights reserved.