The isolation of cleomin from the roots of Ritchiea Longipedicellata Gilg (Capparidaceae)

From root bark of Ritchiea longipedicellata cleomin, S-(-)-ethyl-5-methyl-2-oxozalidine-thione, I, was isolated. The substance, never previous ly found in nature, has been obtained by enzymatic hydrolisys of glucocleomi, III, a mustard oil glucoside.The 1H-NMR spectrum of N-acetylcleomin, II, and 13C-NMR spectrum of cleomin are rerported