Archives of Pharmacal Research, vol. 25, no. 1, pp. 57-60
A new 27-carboxylic lupane-type triterpene, tiarellic acid (1), was isolated from Tiarella polyphylla together with corosolic acid (2) and tormentic acid (3). Tiarellic acid was characterized as 3,23-dihydroxy-20(29)-lupen-27- oic acid and its NMR data were unambiguously assigned using 2-D NMR techniques.