CAS 1233816-83-5 appears in our catalog under these names: Propargyl–PEG4–mesyl ester, Propargyl-PEG4-mesyl ester, 98%, 98%, Propargyl-PEG4-mesyl ester, Propargyl-PEG4-mesyl ester, 98%. Offered by: GLPBio, Chemat, MedChemExpress, Fluorochem. Available pack sizes: 1g, 100mg, 250mg, 500mg, 250 mg, 1 g, 100 mg, 500 mg.