Saponins from the Flower Buds of Buddleja officinalis

Five new saponins, mimengosides C−G (1−5), were isolated from the flower buds of Buddleja officinalis along with five known compounds, namely, songaroside A, acteoside, phenylethyl 2-glucoside, echinacoside, and phenylethyl alcohol 8-O-β-d-glucopyranosyl-(1→2)-β-d-glucopyranoside. The structures of 1−5 were elucidated using spectroscopic and chemical methods, and these compounds were evaluated for their inhibitory effects against HL-60 leukemia cells.