A novel 19,21‐secohetisan diterpenoid alkaloid, tangutisine A (1), was isolated from Aconitum tanguticum (Maxim.) Stapf. Its structure was determined by HR‐EI‐MS and 1D‐ and 2D‐NMR spectroscopy and by comparison with the data of known 19,21‐secohetisan derivatives.
A new diterpenoid alkaloid with an epoxy ring between C(3) and C(17) was isolated from Aconitum episcopale. The structure was elucidated on the basis of spectral and chemical evidence.
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