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.
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