Two new alkaloids, ranaconidine (=20-ethyl-1α,14α,16β- trimethoxyaconitane-4,7,8,10-tetrol; 1) and N-(chloromethyl)taspine (=1-[2-(N-(chloromethyl)-N,N-dimethylaminium)ethyl]-3,8-dimethoxybenzopyrano[5, 4,3-cde]benzopyran-5,10-dione; 2), together with two known compounds, i.e., benzethonium chloride (3) and ranaconine (4) were isolated from the roots of Aconitum sinomontanum Nakai. The structures of the compounds were elucidated on the basis of spectral evidences and in the comparison with previously published data. Copyright © 2014 Verlag Helvetica Chimica Acta AG, Zürich.