MPEG-Thiol, average M.W. 6,000;MPEG-Thiol, average M.W. 10,000;MPEG-Thiol, average M.W. 1,000;MPEG-Thiol, average M.W. 4,000;Mercaptopolyethylene glycol monomethyl etherPEG-thiol;O-[2-(3-Mercaptopropionylamino)ethyl]-Oμ-methylpolyethylene glycol;MPEG-Thiol, average M.W. 2,000;MPEG-Thiol, average M.W. 5,000