Four new C_(19)-diterpenoid alkaloids, 8-O-ethylyunaconitine (1), A^-deethyl chasmanine (2), transconi-tine D (3) and transconitine E (4) , were isolated from the roots of Aconitum, transsectum, Diels. together with 11 known norditerpenoid alkaloids, yunaconitine, indaconitine, vilmorrianine A, vilmorrianine C, crasscualine A, geni- conitine, chasmanine, 8-deacetylyunaconitine, talatisamine, 14- acetyltalatisamine and chasmaconitine. Their structures were assigned on the basis of spectral data (IR, ~1H NMR, ~(13)C NMR, 2D-NMR and MS) .

Key words: aconitum transsectum, DITERPENES, ALKALOID, IR, 1HNMR, C13NMR, 2DNMR, MS