CAS 1670-81-1 appears in our catalog under these names: Indole-5-carboxylic acid, 98%, Indole-5-carboxylic Acid, Indole–5–carboxylic Acid, Indole-5-carboxylic acid, 98% , Indole-5-carboxylic Acid, >98.0%(GC)(T). Offered by: Combi-blocks, TRC, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth. Available pack sizes: 25g, 5g, 1g, 100g, 10g, 250g, 500g, 2000g.