CAS 1224728-09-9 appears in our catalog under these names: H2N-PEG(11)-NH2, Azido-dPEG®,12-OH, N1,N19-Bis(3-(2-(2-(3-aminopropoxy)ethoxy)ethoxy)propyl)-4,7,10,13,16-pentaoxanonadecanediamide 98%, N1,N19-Bis(3-(2-(2-(3-aminopropoxy)ethoxy)ethoxy)propyl)-4,7,10,13,16-pentaoxanonadecanediamide, 98%, 98%. Offered by: Iris Biotech, Biosynth, Ambeed, Chemat. Available pack sizes: 1g, 100mg, 1000mg, 250mg.