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Phytochemical investigation of the aerial parts of Potentilla fulgens L. led to the isolation of two new triterpenes, potentene A (1) and potentene B (2). In addition, three known compounds afzelchin–4α→8″–catechin (3), epiafzelchin (4) and rutin (5) were isolated. The structures of all these compounds were elucidated by extensive spectroscopic and chemical evidence. Compounds 3, 4, and 5 exhibited significant 1,1, diphenyl-2-picrylhydrazyl radical scavenging activity, with IC 50  values of 1.21, 2.88 and 5.20 mg/mL, respectively; the known standard antioxidant, vitamin C, had a value of 0.44 mg/mL.

New Hopane Triterpenes and Antioxidant Constituents from Potentilla Fulgens