Chemical constituents of the aerial parts of Schnabelia tetradonta

A phytochemical study on the ethanol extract of the aerial parts of Schnabelia tetradonta led to the isolation of five new compounds, 1-5, together with seven known compounds. The structures of the new compounds were elucidated on the basis of spectral data interpretation as 2alpha,3alpha,23,29-tetrahydroxyolean-12-en-28-oic acid (1), 3-O-beta-D-glueuronopyranosyl-2beta,3beta,16beta-trihydroxy-28-norolean-12-en-15-on-23-oic acid (2),21-O-beta-D-glucopyranosyl-3beta,21alpha,30-trihydroxyolean-13(18)-en-24-oic acid (3),6-C-beta-L-arabinopyranosyl-8-C-alpha-L-arabinopyranosylapigenin (4), and 4-acetylaminoethylphenyl 1-O-[6-O-(Z)-p-methoxycinnamoyl-beta-D-glucopyranosyl(1-->2)]-[beta-D-glucopyranosyl(1-->3)]-alpha-L-rhamnopyranoside (5), respectively.