CAS 2170240-96-5 appears in our catalog under these names: Azido–PEG4–hydrazide, Azido-PEG4-hydrazide/ 99.95% (existing batch purity), 3-[2-[2-[2-(2-Azidoethoxy)ethoxy]ethoxy]ethoxy]propanoic acid hydrazide, 98%, 98%, Azido-PEG4-hydrazide, 99.62%, Azido-PEG4-hydrazide, 98%. Offered by: GLPBio, TargetMol, Chemat, MedChemExpress, Fluorochem. Available pack sizes: 100mg, 50mg, 2mg, 5mg, 10mg, 25mg, 25 mg, 50 mg.