Wm. Daniewski et al., UTILIN-B, A TETRANORTRITERPENOID OF THE MEXICANOLIDE GROUP FROM BARK OF ENTANDROPHRAGMA-UTILE, Phytochemistry, 33(6), 1993, pp. 1534-1536
New tetranortriterpenoid utilin B has been isolated from the bark of E
ntandrophragma utile, its structure assigned on the basis of extensive
NMR experiments and confirmed by single crystal structure X-ray measu
rement.