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.