From the bark of Uncaria guianensis, two new quinovic acid glycosides, quinovic acid 3β-O-β-d-quinovopyranoside and quinovic acid 3β-O-β-d-fucopyranosyl-(27 → 1)-β-d-glucopyranosylester, have been isolated, in addition to known quinovic acid 3β-O-[β-d-glucopyranosyl-(1 → 3)-β-d-fucopyranosyl]-(27 → 1)-β-d-glucopyranosyl ester and quinovic acid 3β-O-β-d-fucopyranoside. Their structures were elucidated by spectral and chemical studies. © 1991.