1H-Pyrrolo[2,3-b]pyridine-3-acetic acid as a molecular probe for use in auxin physiology

The structural characterization of 1H-pyrrolo[2, 3-b]pyridine-3-acetic acid (alternative name: 7-azaindole-3-acetic acid), C(9)H(8)N(2)O(2), reveals similar molecular geometry, i.e. with the side chain perpendicular to the 7-azaindole ring, to that of the natural plant growth hormone indole-3-acetic acid (auxin) and its alkylated and halogenated derivatives.