New triterpenoid saponins from Maesa japonica

New triterpenoid saponins, maejaposides A, B, C, D, and E, were isolated fr om the roots of Maesa japonica and were, respectively, defined to be 3-O-[b eta-D-xylopyranosyl-(1-->2)-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-galactop yranosyl-(1-->3)] [beta-D-galactopyranosyl-(1-->2)]beta-D-glucuronopyranosi des of 22 alpha-[(Z)-2-hexenoyloxy]-13 beta,28-oxido-olean-16 alpha,28 alph a-diol (1); 22 alpha-[2 '-methylbutanoyl]-13 beta,28-oxido-olean-16 alpha,2 8 alpha-diol (2a) and 22 alpha-angeloyloxy-13 beta, 28-oxido-olean-16 alpha ,28 alpha-diol (2b); 21 beta,22 alpha-diangeloyloxy-13 beta,28-oxido-olean- 16 alpha,28 alpha-diol (3); 21 beta-angeloyloxy,22 alpha-(2 '-methylbutanoy l)-13 beta,28-oxido-olean-16 alpha,28 alpha-diol (4), and 21 beta-angeloylo xy,22 alpha-[(Z)-2 '-hexenoyl]- 13 beta,28-oxido-olean-16 alpha,28 alpha-di ol (5). Their structures were established on the basis of extensive NMR (DE PT, COSY, HOHAHA, HETCOR, HMBC, and NOESY) and ESIMS/MS studies, along with chemical degradation.