L-Aspartyl-L-phenylalanine (Standard) is the analytical standard of L-Aspartyl-L-phenylalanine. This product is intended for research and analytical applications. L-Aspartyl-L-phenylalanine is a metabolite of aspartame that can inhibit angiotensin converting enzyme (ACE) purified from rabbit lungs with a Ki of 11 µM[1].