Two flavonols namely 3,5,7-trihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one (quercetin), 3,5,7-trihydroxy-2-(4- hydroxyphenyl)-4H-chromen-4-one (Kaemferol) and two flavone glycosides 2-(3,4-dihydroxyphenyl)-5,7-dihydroxy- 3-(((3S,4S,5S,6R)-3,4,5-trihydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-4H-chromen-4-one (quercetrin), Rutin followed by ursolic acid, scopoletin have been isolated from the methanolic extract of aerial part of traditional medicinal plant Cotoneaster bacillaris. The structures of the compounds were characterized by using Mass, Proton and 13C-NMR respectively.
