Two New 19-Hydroxyursolic Acid-type Triterpenes from Peruvian ‘Uña de Gato’ (Uncaria tomentosa)

Abstract Two new triterpenes having a 19-hydroxyursolic acid skeleton were isolated from ‘Una de Gato’ ( Uncaria tomentosa ), a traditional herbal medicine in Peru. Their structures were determined by spectroscopic analyses and chemical conversion.