Studies on the Constituents of Cistanchis Herba. II. Isolation and Structures of New Iridoids, Cistanin and Cistachlorin

Abstract

Two new iridoids, named cistanin and cistachlorin, were isolated together with four known compounds, D-mannitol, β-sitosterol, succinic acid and β-sitosterol-β-D-glucoside from the whole plant of Cistanche salsa (C.A. MEY.) G. BECK (Orobanchaceae). The structures of cistanin and cistachlorin were determined as I and II, respectively, on the basis of chemical and spectral data. Compounds I and II are non-glycosidic iridoids ; possessing an ether structure of the type (C-1)-O-(C-10), and II also has a chlorohydrin moiety.