New ceramides from acnistus arborescens

Two new ceramides, N-(4-hydroxyphenethyl)octacosamide (1) and rel-(2S,3S,4R,16E)-2-[(2'R)-2'-hydroxynonadecanoylamino]-heneicosadec-16-ene-1,3,4-triol (2) were isolated from the EtOH extract of Acnistus arborescens. The structures were elucidated by spectroscopic (1D and 2D NMR experiments, HR-ESI-MS, LR-MS and IR) methods

Chemical constituents of Cordia piauhiensis: Boraginaceae

A new monodesmoside triterpenoid saponin characterized as 3beta-O-alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranosyl pomolic acid, was isolated from Cordia piauhiensis Fresen (Boraginaceae). Its structure was determined by extensive NMR analysis, including ¹H, ¹H-COSY, HMQC, HMBC, and NOESY experiments. In addition, four known triterpenoids: quinovic acid, cincholic acid, cincholic 3beta-O-6-deoxy-beta-D-glucopyranoside acid and quinovic 3beta-O-beta-D-glucopyranoside acid were also isolated