2-(1H-indol-3-yl)acetate 2-(1H-indol-3-yl)ethanoate INDOLE_ACETATE_AUXIN auxin indole-3-acetate indoleacetate 1H-indol-3-ylacetate 2-(indol-3-yl)ethanoate CHEBI:30854 (Indol-3-yl)acetate ZINC00083860