title: Structures of new friedelane-type triterpenes and eudesmane-type sesquiterpene and aldose reductase inhibitors from Salacia chinensis.
abstract: Three new friedelane-type triterpenes named salasones A (1), B (2), and C (3), a new norfriedelane-type triterpene, salaquinone A (4), and a new acylated eudesmane-type sesquiterpene, salasol A (5), were isolated from the 80% aqueous methanolic extract of the stems of Salacia chinensis collected in Thailand. Their stereostructures were elucidated on the basis of chemical and physicochemical evidence. In addition, six constituents, 3beta,22beta-dihydroxyolean-12-en-29-oic acid, tingenone, tingenine B, regeol A, triptocalline A, and mangiferin, were found to show an inhibitory effect on rat lens aldose reductase.
mesh_terms: D000449:Aldehyde Reductase / Q000037:antagonists & inhibitors*; D000818:Animals; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006868:Hydrolysis; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D051381:Rats; D045787:Sesquiterpenes, Eudesmane / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D013237:Stereoisomerism; D013785:Thailand; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D004791:Enzyme Inhibitors; D045787:Sesquiterpenes, Eudesmane; D014315:Triterpenes; C421805:friedelane; D000449:Aldehyde Reductase