Ramipril diketopiperazine is a potential impurity found in commercial preparations of ramipril.1
1.Orlandini, S., Gotti, R., Giannini, I., et al.Development of a capillary electrophoresis method for the assay of ramipril and its impurities: An issue of cis-trans isomerizationJ. Chromatogr. A1218(18)2611-2617(2011)
















