Extraction of the aerial part of Uncaria cf. glabrata D.C. (Rubiaceae)
has yielded (2R,3S)-(+)-catechin (1), 14 alpha-hydroxyrauniticine (2)
and rauniticine (3) which were identified by their spectroscopic prop
erties. A single-crystal X-ray structure determination is reported for
rauniticine (3).