COUMARIN GLYCOSIDES FROM 2 SPECIES OF ERIOSTEMON

Examination of the aerial parts of Eriostemon cymbiformis led to the i solation of two novel coumarin glycosides, isobaisseoside -7-(6-alpha- rhamnopyranosyl)-beta-glucopyranoside] [1] and isobaisseoside-4'-p-cou marate [2], along with the common flavonoid glycoside hesperidin from the methanolic extract, and the dihydrocinnamic acid derivative eriost emoic acid from the n-hexane extract. The methanolic extract of the ae rial parts of Eriostemon wonganensis also produced 1, while the petrol eum ether extract of the same yielded two other dihydrocinnamic acid d erivatives, eriostoic acid and the novel methyl ester of eriostemoic a cid [3]. The chemotaxonomic implications of these compound identificat ions are discussed.