Five new (1-5) and twelve known (6-17) different types of glycosides together with a known sesquiterpene triol (18) were isolated from the methanol extract of the rhizomes of Notopterygium incisum. The new structures were elucidated by means of spectroscopic and chemical methods to be pregn-5-en-3 β,20( S)-diol-3- O-bis-β-D-glucopyranosyl-(l → 2,1 → 6)-β-D-glucopyranoside (1), oleuropeic aldehyde 8-O-β-D-glucopyranoside (2), 2( R)-(3,4-dimethoxyphenyl)-propane-1,3-diol-1-O- β-D-glucopyranoside (3), eudesman-3 α,4 α,11-triol-11-O-β-D-glucopyranoside (4), and marmesin-11-O-β-D-glucopyranosyl-(1 → 6)-β-D-glucopyranoside (5). The absolute configuration of the aglycone in compound 3 was assigned by application of Klyne's rule.
Eight pentacyclic triterpenoids were isolated from the methanol extract of the roots of Rhodomyrtus tomentosa. By application of spectroscopic methods (especially 1D-, 2D-NMR, MS), the structures were established as 23-cis-p-coumaroyloxy-2α,3β-dihydroxyolean-12-en-28-oic acid (1), 23-trans-p-coumaroyloxy-2α,3β-dihydroxyolean-12-en-28-oic acid (2), 3β-O-trans-ferulyl-2α,23-dihydroxyolean-12-en-28-oic acid (3), 3β-O-trans-p-coumaroyl-2α,23-dihydroxyolean-12-en-28-oic acid (4), 3β-O-cis-p-coumaroyl-2α,23-dihydroxyolean-12-en-28-oic acid (5), maslinic acid (6), arjunolic acid (7), and 2α,3β-dihydroxytaraxer-20-en-28-oic acid (8). Among them, compounds 1 and 3 were new oleanane-type triterpenoids, while compounds 2, 4~6 and 8 were isolated from this plant for the first time. This is the first report on the chemical constituents from the roots of R. tomentosa.
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