Machocho, Alex K.Chhabra, S. C.Viladomat, F.Codina, C.Bastida, J.2013-10-102013-10-101999Phytochemistry, 51 1185-1191.http://ir-library.ku.ac.ke/handle/123456789/7446DOI: http://dx.doi.org/10.1016/S0031-9422(99)00118-1Sixteen alkaloids have been isolated from fresh bulbs of Ammocharis tinneana (Amaryllidaceae), seven of which contain a 1,2β-epoxide group. 6α-Hydroxycrinamidine and 6α-hydroxyundulatine are reported here for the first time from a natural source. The structures and stereochemistry of these new alkaloids have been determined by physical and spectroscopic methods. 1H and 13C NMR spectra of flexinine, 1,2β-epoxyambelline and 11-O-acetyl-1,2β-epoxyambelline were completely assigned by means of 2D NMR techniques.enAmmocharis tinneanaAmaryllidaceaeAlkaloidsLycorineSternbergine9-O-DemethylpluviineCrininePowellineBuphanisineBuphanidrineAmbelline11-O-AcetylambellineFlexinineCrinamidine6α-HydroxycrinamidineUndulatine6α-Hydroxyundulatine1,2β-Epoxyambelline11-O-Acetyl-1,2β-epoxyambellineArticle