Three New Flavonoid Glycosides, Byzantionoside B 6'-O-Sulfate and Xyloglucoside of (Z)-Hex-3-en-1-ol from Ruellia patula

Three new flavonoid glycosides, demethoxycentaureidin 7-O-β-D-galacturonopyranoside, pectolinarigenin 7-O-α-L-rhamnopyranosyl-(1'''→4''-β-D-glucopyranoside and 7-O-α-L-rhamnopyranosyl-(1'''→4")-β-D-glucuronopyranoside, a new megastigmane glucoside, byzantionoside B 6'-O-sulfate, and a new (Z)-hex-3-en-1-ol O-β-D-xylopyranosyl-(1"→2')-β-D-glucopyranoside, were isolated from leaves of Ruellia patula JACQ., together with 12 known compounds, β-sitosterol glucoside, vanilloside, bioside (decaffeoyl verbascoside), acteoside (verbascoside), syringin, benzyl alcohol O-β-D-xylopyranosyl-(1"→2')-β-D-glucopyranoside, cistanoside E, roseoside, phenethyl alcohol O-β-D-xylopyranosyl-(1"→2')-β-D-glucopyranoside, (+)-lyoniresinol 3α-O-β-D-glucopyranoside, isoacteoside and 3,4,5-trimethoxyphenol O-α-L-rhamnopyranosyl-(1"→6')-β-D-glucopyranoside. Their structures were elucidated by means of spectroscopic analyses. Ruellia patula JACQUIN [syn. Dipteracanthus patulus (JACQ.) NEES.] (Acanthaceae) is a hairy small undershrub, found in Arabia, Africa, Sri Lanka, southwest India and Myanmar.