US 9,869,931 B2  142  141  -continued  -continued  OX  X  /(  DF3  F~-*CF3 F3C  CF3  F  O  OH  O  OH  OX  X  a  U F  F F  F  CF3  CF3  0  OH  O  OH  X  OX  µ F  F  F  F  F  CF3  CF3  F3C  O  OH F 3 C  O  OH  X  C;C  ~  HOY  F3C  X X  ~  ~  F3C  OH  F3C  OH 