2-[2-(1H-Indol-3-yl)ethyl]-propanedioic Acid 1,3-Dimethyl Ester-d4 is an intermediate in synthesizing Indole-3-butyric Acid-d4 (I577802). A labelled Indolebutyric Acid. Used to stimulate root formation of plant clippings. Suitable for plant cell culture tested.