Sesquiterpene lactones and new diterpenoid alkaloids from Artemisia korshinskyi

New diterpenoid alkaloids that were called artekorine (1) and 6-ketoartekorine (2) and had the structures 1α,14α,16β-trimethoxy-4β-N-acetylanthroyloxy-6β,8β-dihydroxy-N-ethylaconitane (1) and 1α,14α,16jtrimethoxy-4β-N-acetylanthroyloxy-6-keto-8β-hydroxy-N-ethylaconitane (2) in addition to sesquiterpene lactones were isolated for the first time from a plant of the genus Artemisia L. (Asteraceae) during an investigation of the aerial part of Artemisia korshinskyi Krash. ex Poljakov. The structures of the diterpenoid alkaloids were established using spectral data and x-ray crystal structure analyses.