Three new saponins from the leaves of Ilex hylonoma.

Three new triterpenoid saponins, hylonosides III-V ( 1 - 3 ) have been isolated, along with three known oleanolic acid saponins ( 4 - 6 ), from the methanol extract of leaves of Ilex hylonoma . The structures were elucidated using a combination of homo- and hetero-nuclear 2D NMR techniques (COSY, TOCSY, NOESY, HMQC and HMBC) and negative FAB-MS. The new compounds were characterized as 3- O -β- d -glucopyranosyl-(1→4)-β- d -glucuronopyranosyl siaresinolic acid-28- O -β- d -glucopyranosyl ester ( 1 ), 3- O -β- d -glucopyranosyl-(1→4)-β- d -glucopyranosyl-(1→2)-β- d -glucuronopyranosyl siaresinolic acid-28- O -β- d -glucopyranosyl ester ( 2 ), 3- O -β- d -glucopyranosyl-(1→4)-β- d -glucopyranosyl-(1→2)-β- d -glucuronopyranosyl oleanolic acid-28- O -β- d -glucopyranosyl ester ( 3 ). [ABSTRACT FROM AUTHOR]