N-[2-(Indol-3-yl-2,4,5,6,7-d5)acetyl]-L-aspartic-15N Acid is an isotopic analog of Indole-3-acetyl-L-aspartic Acid (I577370), an indole-3-acetyl-amino acid conjugate involved in regulatory mechanisms for the control of auxin activity during physiological and pathophysiological responses. This compound can be used to regulate indole-3-acetic acid levels in plants using immunoaffinity extraction.