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Two sulfonated C 20 -diterpenoid alkaloid iminiums with a novel skeleton, named aconicatisulfonines A ( 1 ) and B ( 2 ), respectively, were isolated from a water extract of the Aconitum carmichaelii lateral roots. Structures of 1 and 2 were determined by spectroscopic data and quantum calculations as well as X-ray crystallographic analysis. Biosynthetic pathways via semipinacol rearrangements of atisane derivatives are proposed for 1 and 2 . Compounds 1 and 2 exhibited remarkable analgesic activities against acetic acid-induced mice writhing.
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Wu et al. (2019) studied this question.
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