Studies on the constituents of cistanchis herba. IV. Isolation and structures of two new phenylpropanoid glycosides, cistanosides C and D.

Two new phenylpropanoid glycosides, named cistanosides C and D, were isolated from the whole plant of Cistanche salsa (C. A. MEY.) G. BECK (Orobanchaceae), together with 2'-acetyl acteoside and osmanthuside B. The structures of cistanosides C and D were established as 2-(4-hydroxy-3-methoxyphenyl) ethyl O-α-L-rhamnopyranosyl-(1→3)-O-(4-O-caffeoyl)-β-D-glucopyranoside (II) and 2-(4-hydroxy-3-methoxyphenyl) ethyl O-α-L-rhamnopyranosyl-(1→3)-O-(4-O-feruloyl)-β-D-glucopyranoside (III), respectively, on the basis of chemical and spectral data.