<jats:p><jats:bold>Panicutin, a New Alkaloid from <jats:italic>Aconitum paniculatum</jats:italic> LAM.</jats:bold><jats:p>A new diterpene alkaloid, which we named panicutine (<jats:bold>2</jats:bold>), was isolated from the paniculatine‐containing chemovariety of <jats:italic>Aconitum paniculatum</jats:italic> LAM. Investigation by spectral methods showed that <jats:bold>2</jats:bold> has the formula C<jats:sub>23</jats:sub>H<jats:sub>29</jats:sub>N<jats:sub>44</jats:sub> and belongs to the hetidine (<jats:bold>1</jats:bold>)‐type alkaloids. It has one acetoxy group at C(2) and one carbonyl group each at C (6) and C (11).