New triterpenoid saponins from Maesa japonica

New triterpenoid saponins, maejaposides A, B, C, D, and E, were isolated from the roots of Maesa japonica and were, respectively, defined to be 3-O-[beta-D-xylopyranosyl-(1-->2)-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-galactopyranosyl-(1-->3)] [beta-D-galactopyranosyl-(1-->2)]beta-D-glucuronopyranosides of 22 alpha-[(Z)-2-hexenoyloxy]-13 beta,28-oxido-olean-16 alpha,28 alpha-diol (1); 22 alpha-[2 '-methylbutanoyl]-13 beta,28-oxido-olean-16 alpha,28 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 '-methylbutanoyl)-13 beta,28-oxido-olean-16 alpha,28 alpha-diol (4), and 21 beta-angeloyloxy,22 alpha-[(Z)-2 '-hexenoyl]- 13 beta,28-oxido-olean-16 alpha,28 alpha-diol (5). Their structures were established on the basis of extensive NMR (DEPT, COSY, HOHAHA, HETCOR, HMBC, and NOESY) and ESIMS/MS studies, along with chemical degradation.