Jul. 4, 2019  56  US 2019/0204738 Al  -continued  [0493]  Specific examples of suitable cations represented  by Formula (ca-4) include cations represented by Formulae  (ca-4-1) and (ca-4-2) shown below.  [0494]  Further, as the cation represented by Formula (ca- 5), cations represented by Formulae (ca-5-1) to (ca-5-3) are  also preferable.  (ca-5-1)  (ca-3-4)  (ca-3-5)  (ca-3-6)  Q  sfi  s  OR’212  R•"’o,O  ’Qs,0  ’QsAJ  ¢  OR’212  (ca-5-2)  (ca-4-1) 