CAS 39927-08-7 appears in our catalog under these names: Poly(ethylene glycol) bis(carboxymethyl) ether, HOOC-PEG-COOH average Mw 600 average Mn 600, HOOC-PEG-COOH average Mw 400 average Mn 400, HOOC-PEG-COOH average Mw 35000 average Mn 35000, HOOC-PEG-COOH average Mw 2000 average Mn 2000. Offered by: GLPBio, Ambeed, Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 25ml, 50ml, 5ml, 5g, 25g, 100g, 500g, 100mg.