Displaying 3 results of Phenylbutyrate Stable Isotopes Phenylbutyrate stable isotopes refer to isotopically labeled versions of the small molecule phenylbutyrate. These isotopes have been selectively labeled with stable isotopes of carbon, nitrogen, and hydrogen, which allows for precise and accurate tracking of the compound in biological systems. This is useful for understanding the metabolism, distribution, and efficacy of phenylbutyrate in clinical and pre-clinical settings. Additionally, these stable isotopes can be used as internal standards in analytical assays for the quantification of phenylbutyrate and related compounds.