Anilinoacetaldehyde Diethyl Acetal-d5 is a labelled analogue of Anilinoacetaldehyde Diethyl Acetal (B411088) and is an intermediate in the synthesis of Indole-4,5,6,7-d4, a labelled analogue of Indole (I577320), which can be used in perfumes and in the synthesis of tryptophan. Indole-4,5,6,7-d4 is also an intermediate in synthesizing Indoleacetic Acid-13C6 (I577343), which has the potential to be used in anti-cancer therapy in conjunction with horseradish peroxidase (HRP).