I need Hexafluoro-2-propanol or Hexafluoroisopropanol for SPECTROSCOPIC study of beta-amyloid (a very costly item). Unfortunately I can't see Hexafluoro-2-propanol (liquid) in Sigma-Aldrich. So I am looking for some other brand. But it should be good enough to solve our purpose. So please help me by mentioning the brand. I'm expecting those who are working in the same field will help me.