Constituents of Nepeta clarkei Hook.f. and their antioxidant activity

Abstract

807-811Three diterpenoids p-benzochinone, labda-14-en-8,13-diol, coleon U 12-methyl ether, a triterpenoid ursolic acid and two sterols have been isolated and identified from the roots of Nepeta clarkei Hook.f. The antioxidant activities of four isolates have also been determined, of which, coleon U 12-methyl ether and p-benzochinone have shown good DPPH scavenging activity with IC50 value 0.045 mg/mL and 0.059 mg/mL, respectively