A new active compound against kidney deficiency from the fruits of Rubus corchorifolius.

Constituents of the fruits of Rubus corchorifolius were investigated. A new compound, namely rubusin A (1), along with three known compounds, was isolated and characterized. Among them, the new compound exhibited significant activity against kidney deficiency, and quercetin and kaempferol were isolated from the fruits of R. corchorifolius for the first time.