Tirucallane-type triterpenoids: NMR and X-ray diffraction analyses of 24-epi-piscidinol A and piscidinol A. - McChesney ,J.D,.; Dou ,J,.; Sindelar ,R.D,.; Goins ,D.K,.; Walker ,L.A,.; Rogers ,R.D.. (J. Chem. Crystallogr., 1997)