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ChEBI: Indole-3-butyric acid is a indol-3-yl carboxylic acid that is butanoic acid carrying a 1H-indol-3-yl substituent at position 1. It has a role as a plant hormone, a plant metabolite and an auxin. It is functionally related to a butyric acid. It is a conjugate acid of an indole-3-butyrate.