CAS 1667709-77-4 appears in our catalog under these names: methyl 2-({[(2-oxothiolan-3-yl)carbamoyl]methyl}sulfanyl)acetate, 95%, Erdosteine Methyl Ester, Erdosteine Methyl Ester, >95% (HPLC). Offered by: Combi-blocks, Chemat Brand, TRC, Mikromol. Available pack sizes: 5g, 1g, on request, 250mg, 500mg, 50mg, 25mg, 100mg.