CAS 1245718-89-1 appears in our catalog under these names: N3–PEG3–C2–NHS ester, N3-PEG3-C2-NHS ester 97%, 2,5-Dioxopyrrolidin-1-yl 3-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)propanoate, 95%, 95%, N3-PEG3-C2-NHS ester, 99.94%, Azido-PEG3-NHS ester, 95%. Offered by: GLPBio, Ambeed, Chemat, MedChemExpress, Fluorochem. Available pack sizes: 1g, 500mg, 250mg, 5g, 100mg, 10g, 500 mg, 100 mg.