CAS 2244684-38-4 appears in our catalog under these names: Boc–PEG4–acid, Boc-PEG4-acid 98%, HOOCCH2O-PEG4-CH2COOtBu, 97%, 97%, Boc-PEG4-acid. Offered by: GLPBio, Ambeed, Chemat, MedChemExpress. Available pack sizes: 100g, 100mg, 250mg, 1g, 500mg, 25 mg, 50 mg, 100 mg.