Characterization of an ursane triterpenoid from centella asiatica with growth inhibitory activity against spilarctia obliqua.

A new triterpenoid glycoside 3-O-[a-L-arabinopyranosyl] 2 a, 3 ß , 6 ß , 23-a tetrahydroxyurs-12-ene-28-oic acid ( 1 ) accompanied by 6ß-hydroxyasiatic acid and asiatic acid were isolated from Centella asiatica . The structure of 1 was established by physicochemical data. Compound 1 exhibited dose-dependent growth inhibitory activity against larvae of Spilarctia obliqua but was not as active as azadirachtin.