3-Indolebutyric acid (IBA) kahi axin endogenous, he huahana crystalline keʻokeʻo ka huahana maʻemaʻe, a keʻokeʻo ka lāʻau lapaʻau mua i nā aniani melemele. Hiki ke hoʻoheheʻe ʻia i nā mea hoʻoheheʻe kūlohelohe e like me acetone, ether a me ethanol, akā paʻakikī hiki ʻole ke hoʻoheheʻe ʻia i ka wai.