CAS 401916-61-8 appears in our catalog under these names: mPEG–SH, O-(2-(3-MERCAPTOPROPIONYLAMINO)ETHYL)- &, α-[2-[(3-Mercapto-1-oxopropyl)amino]ethyl]-ω-methoxypoly(oxy-1,2-ethanediyl). Offered by: GLPBio, Sigma-Aldrich, Chemat. Available pack sizes: 1g, 200mg, 5g, 250MG, 100mg.