The more polar metabolites from the Venezuelan plant Verbesina caracasana, ie, N 3- prenylagmatine,(3, 4-dimethoxycinnamoyl)-N 1-agmatine, agmatine, and galegine (prenylguanidine), previously reported (Delle Monache, G.; et al. BioMed. Chem. Lett. 1999, 9, 3249-3254), have been synthesized following a biosynthetic strategy. The pharmacologic profiles of various synthetic analogues of (3, 4-dimethoxycinnamoyl)-N 1-agmatine (G5) ...