Sep. 10,2020  43  US 2020/0285149 Al  (1-1)  (1-2)  R104  I  1+  x- i  RIOS  [0113]  In formulae  (1-1)  and (1-2), R 101 , R 102 , R 103 , R 104  and R 105  are each independently a C$_{1}$-C$_{20 }$ monovalent  hydrocarbon group which may contain a heteroatom. Any  two ofR 101 , R $^{102 }$and R$^{103 }$may bond together to form a ring  with the sulfur atom to which they are attached. The  monovalent hydrocarbon group may be straight, branched or  cyclic, and examples thereof include those exemplified  above for R$^{21 }$to R$^{28 }$in formulae (fl) to (f3).  [0114]  Examples of the cation in the sulfonium salt having  formula  (1-1)  are shown below, but not limited thereto.  -continued 