J Nat Prod 1990 May-Jun;53(3):559-64
New polyhydroxylated triterpenes from Uncaria tomentosa.
Aquino R, De Simone F, Vincieri FF, Pizza C, Gacs-Baitz E.
Dipartimento di Chimica delle Sostanze Naturali, Universita degli Studi di Napoli, Italy.
Three novel polyhydroxylated triterpenes have been isolated from Uncaria tomentosa. Their structures were established as 1, 2, and 3 by detailed spectral studies including 1H-13C correlations via long range couplings using the INAPT pulse sequence, nOeds, and 2D 1H-13C direct chemical shift correlation (HETCOR) nmr techniques.