CAS 1108750-59-9 appears in our catalog under these names: Azido–(PEG)n–NHS Ester, N3-PEG(12)-NHS, Azido-dPEG®, 12-NHS ester, TFP-dPEG®,4-( m-dPEG®,24)3-Ester. Offered by: GLPBio, Iris Biotech, Biosynth. Available pack sizes: 250mg, 1g, 100mg, 1000mg.