Separation of the phenolic fraction of Corydalis ochotensis afforded a new spirobenzylisoquinoline alkaloid, isoochotensine (1) and three known alkaloids, ochotensine (3), cheilanthifoline (7), and lienkonine (9) as their acetyl derivatives together with a known nonphenolic alkaloid, ochotensimine (5). Their structures were elucidated by the spectral data. Copyright © 1987 The Chemical Society Located in Taipei & Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim, Germany