Synonyms: 4-(3-Indolyl)butanoic acid, 4-(3-Indolyl)butyric acid, IBA CAS: 133-32-4 Empirical Formula: C12H13NO2 Molecular Weight: 203.24 g/mol Test Specification Appearance White to off-white to rose to tan fine crystalline powder Melting Range 120° - 125°C Identification (by IR) Conforms to structure and standard Solubility Soluble in methanol, alcohol, acetone, alkalies and acids Water (K.F.) 0.5% max. Heavy Metals (as Pb) 10 ppm max. Carbon 69.5 - 72.3% Nitrogen 6.75 - 7.02%