CAS 1821464-56-5 appears in our catalog under these names: Azide-PEG12-Tos/ 98.72% (existing batch purity), Azide–PEG12–Tos, Azide-PEG12-Tos, Azide-PEG12-Tos 98%, 35-Azido-3,6,9,12,15,18,21,24,27,30,33-undecaoxapentatriacontyl 4-methylbenzenesulfonate, 98%, 98%. Offered by: TargetMol, GLPBio, Biosynth, Ambeed, Chemat. Available pack sizes: 2mg, 5mg, 10mg, 25mg, 50mg, 100mg, 200mg, 250mg.