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■ Structure and Stereochemistry of Thalicsiline, a New Antiinflammatory C₂₀ — Diterpenoid Alkaloid from Thalictrum sessile

Yang-Chang Wu,* Tian-Shung Wu, Masatake Niwa, Sheng-Teh Lu, Yoshimasa Hirata, Donald R. McPhail, Andrew T. McPhail,* and Kuo-Hsiung Lee*

*Division of Medicinal Chemistry and Natural Products, School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7360, U.S.A.

Abstract

Antiinflammatory thalicsiline, the first ajaconine-type alkaloid bearing an oxygen funcrton at C₆, has been isolated from Thalictrum sessile, and its structure and stereochemistry have been established by spectral data and a single-crystal-X-ray analysis.