CAS 252881-73-5 appears in our catalog under these names: N3–PEG3–CH2CH2–Boc, N3-PEG3-tBu, N3-PEG3-CH2CH2-Boc 95%, tert-Butyl 3-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)propanoate, 98%, 98%, N3-PEG3-CH2CH2-Boc, 98.0%. Offered by: GLPBio, Biosynth, Ambeed, Chemat, MedChemExpress. Available pack sizes: 100mg, 250mg, 500mg, 1000mg, 1g, 5g, 100 mg, 10 g.