Abstract
Rhynchosia pseudo-cajan Cambess. (papilionaceae) is a common weed which is medicinally important. It is an erect shrub having whitish leaflets on lower side. Its common name is Lahrr. It is distributed in Jammu & Kashmir and Pakistan. Its leaves are used as tonic and stomach disorders, leaves and bark powder is useful for peptic ulcer and other digestive problems. The crude drugs of Rhynchosia are used in the formation of fermented liquor having antioxidative, antitumor, skin whitening and arthritis preventing and treating effects. Since now no phytochemical studies have been carried out on this species but many important compounds have been discovered from other species of genus Rhynchosia. Tirumalin, a prenylated dihydroflavanol was isolated from Rhynchosia cyanosperma. Rhynchosin, a new 5-deoxyflavonol was isolated from leaves of Rhynchosia beddomei. The leaves of Rhynchosia rufescenes contain methylated flavonols such as kaempferol, kaempferol 3-methyl ether and quercetin 3-methyl ether, which are of chemotaxonomic importance. Many flavonoides have been Synthesis of Some 4'-O Substituted Derivatives of Natural Naringin and Their Biological Screening
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