Isolation and structural identification of 8(14),15-sandaracopimaradiene-7α, 18-diol from Iboza riparia - De Kimpe,N.; Schamp,N.; Van Puyvelde,L.; Dubé,S.; Chagnon-Dubé,M.; Borremans,F.; Anteunis,M.JO.; Declercq,J.-P.; Germain,G.; Van Meerssche,M. (J. Org. Chem., 1982)