<jats:p> The alkaloids of Corydalis ochotensis consist of four known bases, namely, protopine, cryptocavine, ochotensine, and aurotensine, together with two new ones, namely, ochotensimine (F48) and alkaloid F49. Ochotensimine is the O-methyl ether of ochotensine. It has not been obtained crystalline, but it has been characterized as the methiodide and the derived dihydro-methine base. In addition to acetyl-ornithine, the isolation of which has already been recorded, fumaric acid and maltol were also found.