CAS 83863-74-5 appears in our catalog under these names: 2-Carboxymethyl-1-methylpyrrole-3-carboxylic acid, 97%, 2-(Carboxymethyl)-1-methyl-1H-pyrrole-3-carboxylic acid 98%, 2-(carboxymethyl)-1-methyl-1H-pyrrole-3-carboxylic acid, 98%, 98%, 2-(CARBOXYMETHYL)-1-METHYL-1H-PYRROLE-3-CARBOXYLIC ACID, 98%. Offered by: Combi-blocks, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 10g, 25g, 5g, 250mg.