New prenylated flavonoids from the leaves of Dodonea viscosa native to the Sultanate of Oman

The highest antioxidant activity in crude extracts from the leaves of D. viscosa was in the hexane and chloroform crude extracts, and the lowest activity was in the water crude extract, followed by hexane > chloroform > ethyl acetate > methanol > butanol > water crude extracts. One new prenylated flavonoid along with one known compound were isolated from the chloroform crude extract of D. viscosa and were identified by their chemical structures using mass spectrometry, one and two dimension nuclear magnetic resonance. The isolated pure compound also showed significant antioxidant activity against DPPH. This is the first report of antioxidant compounds in the leaves of D. viscosa. The results obtained from this study might be a good natural antioxidant from the selected plant crude extracts.