CAS 306936-53-8 appears in our catalog under these names: Methyl 5-(chlorosulfonyl)-1-methyl-1H-pyrrole-2-carboxylate, 97%, Methyl 5-(chlorosulfonyl)-1-methyl-1H-pyrrole-2-carboxylate, 95%. Offered by: Combi-blocks, Fluorochem. Available pack sizes: 250mg, 5g, 1g, 100mg.