Seven aliphatic pyrrolidine amides with branched and linear saturated C15–C19 acyl moieties were detected in vegetative plant organs of Ipomoea aquatica and Merremia quinquefolia as well as in seeds of M. quinquefolia by GC–MS analysis. One of the compounds was isolated from both species and characterized as 1-(14- methylhexadecanoyl) pyrrolidine, a new natural product. The presence of 1- ...