CAS 1398044-55-7 appears in our catalog under these names: Azido-PEG4-Amido-Tris, Azido–PEG4–Amido–Tris, Azido-PEG4-Amido-Tris 95%, Azido-PEG4-Amido-Tris, 96.39%, 15-Azido-N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]-4,7,10,13-tetraoxapentadecanamide, 95%, 95%. Offered by: TargetMol, GLPBio, Biosynth, Ambeed, MedChemExpress. Available pack sizes: 2mg, 5mg, 10mg, 100mg, 50mg, 250mg, 500mg, 1g.