Two phenylpropanoid glycosides from Leonurus glaucescens

Two new phenylpropanoid glycosides, leonosides A and B, and two known glycosides lavandulifolioside and verbascoside, were isolated from the aerial parts of Leonurus glaucescens. On the basis of chemical and spectral evidence, leonosides A and B were shown to be β-(3,4-dihydroxyphenyl)-ethyl-O-α-l-arabinopyranosyl-(1→2)-α-l-rhamnopyranosyl-(1→3)-4-O-feruloyl-β-d-glucopyranoside and β-(3-hydroxy, 4-methoxyphenyl)-ethyl-O-α-l-arabinopyranosyl-(1→2)-α-l-rhamnopyranosyl-(1→3)-4-O-feruloyl-β-d-glucopyranoside, respectively.