Oct. 8, 2020  29  US 2020/0319551 Al  group, not only a phenyl group, a naphthyl group, or the like  but also a heteroaryl group such as an indole residue and a  pyrrole residue can also be used,  [0412]  As the alkyl group of each of R$_{201 }$to R$_{203}$ , a linear  or branched alkyl group having 1 to 10 carbon atoms is  preferable, and a methyl group, an ethyl group, an n-propyl  group, an i-propyl group, an n-butyl group, or the like is  more preferable,  [0413]  As the cycloalkyl group of each of R$_{201 }$ to R$_{203}$ , a  cycloalkyl group having 3 to 10 carbon atoms is preferable,  and a cyclopropyl group, a cyclobutyl group, a cyclopentyl  group, a cyclohexyl group, or a cycloheptyl group is more  preferable,  -continued  [0414]  Examples of the substituent which may be con› tained in such the groups include a nitro group, a halogen  atom such as a fluorine atom, a carboxyl group, a hydroxyl  group, an amino group, a cyano group, an alkoxy group  (preferably having 1 to 15 carbon atoms), a cycloalkyl group  (preferably having 3 to 15 carbon atoms), an aryl group  (preferably 6 to 14 carbon atoms), an alkoxycarbonyl group  (preferably 2 to 7 carbon atoms), an acyl group (preferably  2 to 12 carbon atoms), an arylcarbonyl group (preferably  having 7 to 15 carbon atoms), an alkylarylcarbonyl group  (preferably having 8 to 18 carbon atoms), a cycloalkylsul› fonyl group, and an alkoxycarbonyloxy group (preferably  having 2 to 7 carbon atoms), Further, the substituent may  have an acid-decomposable group,  [0415]  In General Formula  (ZII),  [0416]  R$_{204 }$to R$_{205 }$ each independently represent an aryl  group, an alkyl group, or a cycloalkyl group,  [0417]  The aryl group, the alkyl group, and the cycloalkyl  group of each of R$_{204 }$and R$_{205 }$ are the same as the groups  described as the aryl group, the alkyl group, and the  cycloalkyl group of each of R$_{201 }$ to R$_{203}$ , respectively, in  General Formula  (ZI),  [0418]  Examples of the substituents which may be con› tained in the aryl group, the alkyl group, and the cycloalkyl  group of each of R$_{204 }$ and R$_{205 }$ include the substituents  which may be contained in the aryl group, the alkyl group,  and the cycloalkyl group of each of R$_{201 }$ to R$_{203 }$ in the  above-mentioned General Formula  (ZI),  [0419]  As the compound Y, a compound represented by  General Formula (PAI) or (PA2) is preferable,  [0403]  (Cation)  [0404]  The compound Y is preferably the onium salt  compound, and more preferably a sulfonium salt compound  of the anion represented by General Formula (dla), General  Formula (d2a), General Formula (PA-Ia), General Formula  (PA-Ila), or General Formula (PA-Illa) with a sulfonium  cation, or an iodonium salt compound of the anion repre› sented by General Formula (dla), General Formula (d2a),  General Formula (PA-Ia), General Formula (PA-Ila), or  General Formula (PA-Illa) with an iodonium cation,  [0405]  The sulfonium cation of the sulfonium salt com› pound is preferably represented by General Formula (ZT)  and the iodonium cation of the iodonium salt compound is  preferably represented by General Formula  (ZII),  [0406]  In General Formula  (ZI),  [0407]  R$_{201}$, R 202 , and R $_{203 }$each independently represent  an organic group,  [0408]  The organic group as each ofR$_{201}$ , R 202 , and R 203  preferably has 1 to 30 carbon atoms, and more preferably  has 1 to 20 carbon atoms,  [0409]  In addition, two of R$_{201 }$ to R$_{203 }$may be bonded to  each other to form a ring structure and the ring may include  an oxygen atom, a sulfur atom, an ester bond, an amide  bond, or a carbonyl group, Examples of the group formed by  the bonding of two ofR$_{201 }$to R$_{203 }$include an alkylene group  (for example, a butylene group and a pentylene group),  [0410]  Examples of the organic group of each of R$_{201}$ ,  R$_{202}$, and R$_{203 }$include an aryl group, an alkyl group, and a  cycloalkyl group,  [0411]  It is preferable that at least one of R$_{201}$, R 202 , or  R$_{203 }$ is an aryl group, and it is more preferable that all of  R$_{201}$, R 202 , and R 203  represent an aryl group, As the aryl  [0420]  In General Formula (PAI),  [0421]  R’$_{20}$$^{i, R’}$202, and R’$_{203 }$each independently represent  an organic group, and specifically, are the same as R$_{201}$ ,  R$_{202}$, and R$_{203 }$in Formula  (ZI),  [0422]  x- represents an anion, The anion is preferably an  anion represented by General Formula (dla), (d2a), (PA-Ia),  (PA-II), or (PA-Ila),  (PA!)  R’201  I  R’202-S+ x- i  R’203  (ZI)  (ZII)  (PA2)  R’2os  I  1+  x- i  R’204  (dl-a27)  F2  F2  0  H3CYC’~,(CYO  0  0  pKa0,52  (dl-a28)  pKa0,52  pKa-0,2 