A NOVEL ELEVEN-MEMBERED-RING TRITERPENE DILACTONE,PSEUDOLAROLIDE F AND A RELATED COMPOUND, PSEUDOLAROLIDE E,FROM PSEUDOLARIX KAEMPFERI

摘要

A novel eleven-membered-ring triterpene dilactone, pseudolarolide F (1), and a related compound, pseudolarolide E (2), were isolated from the seeds of Pseudolarix kaempferi, a plant indigenous to eastern China. Their structures and stereochemistry were established by spectro scopic studies, which included UV, IR, HREIMS, 2D NMR correlation methods (1H 1H COSY, 13C-1H COSY, NOESY, HMQC, and HMBC), and single-crystal X-ray analysis.