N-(Phenylacetyl-d5)glycine (2-(2-Phenylacetamido)acetic acid-d5) is the deuterium labeled Phenylacetylglycine. Phenylacetylglycine is a gut microbial metabolite that can activate β2AR. Phenylacetylglycine protects against cardiac injury caused by ischemia/reperfusion[2].In Vitro:Stable heavy isotopes of hydrogen, carbon, and other elements have been incorporated into drug molecules, largely as tracers for quantitation during the drug development process. Deuteration has gained attention because of its potential to affect the pharmacokinetic and metabolic profiles of drugs.