1 1 1 3 3 3-hexafluoro-2-propanol hplc July 8, 2019 16 32 64 128 1 1 1 3 3 3-hexafluoro-2-propanol 1 1 1 3 3 3-hexafluoroisopropanol 1 1 1 3 3 3-hexafluoro-2-propanol sigma