Arylethyl (= Phenylethanoid) Glycosides and Oligosaccharide from the Stem of Cistanche tubulosa

Abstract Three new analogues of the arylethyl (= phenylethanoid) glycoside echinacoside ( 5 ), namely cistantubulosides A ( 1 ), B 1 /B 2 ( 2a / 2b ), and C 1 /C 2 ( 3a / 3b ), and one new oligosaccharide, cistantubulose A 1 /A 2 ( 4a / 4b ), were isolated from the stems of Cistanche tubulosa ( Schenk ) R. Wight , together with five known compounds, i.e. , campneoside I, campneoside II ( 6 ), echinacoside ( 5 ), tubuloside, and cistanoside F. Among the compounds isolated, 2a / 2b, 3a / 3b, 4a / 4b , campneoside I, campneoside II ( 6 ), and cistanoside F each consisted of a pair of epimers. The structures of the new compounds were elucidated on the basis of spectral data.