[Diterpenoid alkaloids of Aconitum sinomontanum var. angustius W.T. Wang]

Three diterpenoid alkaloids were isolated from Aconitum sinomontanum var. angustius distributed in south Gansu. They were identified as ranaconitine (I), lappaconitine (II), 3-acetylaconitine (III) on the basis of spectral evidences (UV, IR, HNMR, 13CNMR, MS).