Methyl-tetrahydroxyflavone

Flavonols. The most common flavonols (3-hydroxyflavones) include kaempferol (3,5,7,4 -tetrahydroxyflavone), quercetin (3,5,7,3, 4 -pentahydroxyflavone), myricetin (3,5,7,3, 4, 5 -hexahydroxyflavone), quercitrin (quercetin 3-0-rhamnoside), isoquercitrin (quercetin 3-0-glucoside), isorhamnetin (quercetin 3 -methyl ether) and rutin (quercetin... 

Kaempferol 4 -O-methyl ether 4 -O-Methyl-3,5,7,4 -tetrahydroxyflavone) (flavonol) (Adiantaceae) [fern exudate], Betulaceae, Baccharis spp. (Asteraceae), Prunus cerasus (Rosaceae), Lmaria dalmatia (Scrophulariaceae) [aerial], Alpinia galanga (Zingiberaceae) (TPA induced)]... 

Pisutthanan et al. (27) isolated six flavonoids out of which three were reported in this plant for the first time. They include 3,5,4 -trihydroxy-7-methoxyflavanone 5,7,3 -trihydroxy-5 -methoxyflavanone and 3,5,7-trihydroxy-4 -methoxyflavanone. Ling et al. (28) also isolated a total of eleven flavonoids from the leaf extract and identified them as eriodictyol 7,4 -dimethyl ether, quercetin 7,4 -dimethyl ether, naringenin 4 -methyl ether, kaempferol 4 -methyl ether, kaempferol 3-0-mtinoside, taxifolin 4 -methyl ether, taxifolin 7-methyl ether and quercetin 4 -methyl ether. Suksamram et al. (23) isolated the flavanones, isosakuranetin (5,7-dihydroxy-4 -methoxyflavanone), persicogenin (5,3 -dihydroxy-7,4 -dimethoxyflavanone), 5,6,7,4 -tetramethoxyflavanone and 4 -hydroxy-5,6,7-trimethoxyflavanone, the chalcones, 2 -hydroxy-4,4, 5, 6 -tetramethoxychalcone and 4,2 -dihydroxy-4, 5, 6 -trimethoxychalcone, and the flavones, acacetin (5,7-dihydroxy-4 -methoxyflavone) and luteolin (5,7,3, 4 -tetrahydroxyflavone) from the flowers. 

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