34  US 9,069,246 B2  33  7  9  10  11  12  4  3  2 CF orCH20H,  rchem.161  ’  Rx rep=ents H, c:i,~1.,’oup having a  (In  the formula  d  Rxh represents~  hofRxa an  and eac  f 1 to 4.)  carbon number o  -continued 