3-(1,1,2,2-Tetrahydroperfluoro(C6-C20)alkylthio)-2-hydroxy-1-(methoxypolyethyleneoxy)propane 70983-59-4 Poly(oxy-1,2-ethanediyl), alpha-methyl-omega-hydroxy-, 2-hydroxy-3-((gamma-omega-perfluoro-C6-20-alkyl)thio)propyl ethers