MRI-1776-SIL-D9 is derived from Phenylacetic Acid-d5 (P319182), which is a labeled Phenylacetic Acid is used in the synthesis of deuterium labeled Diclofenac (D436450) and its metabolite 4'-Hydroxydiclofenac (H825225), which is the principal human metabolite of Diclofenac.