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Three new phenolic glycosides were isolated from the methanol extract of fresh roots of Molineria latifolia, including 1) molineriosides A (3: 5-hydroxy-2-[β-fructopyranosyl-(2→6)-β-glucopyranosyl]-benzyl-2',6'-dimethoxybenzoate); 2) molinerioside B (4: 3,4-di-β-D-glucopyranosyloxybenzyl-2',6'-dimethoxybenzoate); and 3) molinerioside C (12: 4-(1-(3,4-dihydroxyphenyl)-5-hydroxy-4-β-glucopyranosyloxypent-1-enyl)benzene-1,2-diol. Their structures were determined based on the spectroscopic evidence including 1D and 2D NMR, and HR-ESI-MS experiments. Molinerioside A is a benzylbenzoate diglycoside having β-fructopyranosyl-(2→6)-β-glucopyranosyl unit which is a rare compound to be found in the natural source. In addition to the three new compounds, the nine known phenolic glycosides were isolated: curculigoside, curculigoside H, 3-hydroxy-5-methylphenyl 1-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside, nyasicoside, crassifoside B, 1-O-methylcurculigine, 1-O-methyisolcurculigine, capituloside and curcapicycloside. |
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