Alkaloidal and neutral substances of Formosan Corydalis koidzumiana OHWI were examined. Protopine, α-allocryptopine, dl-tetrahydropalmatine, d-corydaline, d-stylopine, l-scoulerine, l-capaurine, l-isocorypalmine, l-cheilanthifoline, d-corybulbine, sanguinarine, oxysanguinarine, dihydrosanguinarine, L-(+)-reticuline, sinoacutine, pallidine, and 10-nonacosanol were isolated from the whole herb of this plant.
