US 9,097,971 B2  133  134  -continued  alkyl group for R’, the same alkyl groups, alkoxy groups,  halogen atoms, halogenated alkyl groups, --COOR", -DC  (=O)R" (R" is the same as defined above) andhydroxyalkyl  groups as those described above as the substituent for the  -SO$_{2}$ - containing cyclic group can be mentioned.  As the alkyl group for R’, an alkyl group of  1  to 5 carbon  atoms is preferable, and examples thereof include a methyl  group, an ethyl group, a propyl group, an n-butyl group and a  tert-butyl group.  As the alkoxy group for R’, an alkoxy group ofl to 5 carbon  atoms is preferable, and examples thereof include a methoxy  group, an ethoxy group, an n-propoxy group, an iso-propoxy  group, an n-butoxy group and a tert-butoxy group  In terms of industrial availability, R’ is preferably a hydro- gen atom.  The alkyl group for R" may be any of linear, branched or  cyclic.  When R" is a linear or branched alkyl group, it preferably  has  1  to  10  carbon atoms, more preferably  1  to 5 carbon  atoms.  When R" is a cyclic alkyl group ( cycloalkyl group), it  preferably has 3 to 15 carbon atoms, more preferably  4  to 12  carbon atoms, and most preferably 5 to  10  carbon atoms. As  examples of the cycloalkyl group, groups in which one or  more hydrogen atoms have been removed from a monocy- cloalkane or a polycycloalkane such as a bicycloalkane, tri- cycloalkane or tetracycloalkane, which may or may not be  substituted with a fluorine atom or a fluorinated alkyl group,  may be used. Examples of such groups include groups in  which one or more hydrogen atoms have been removed from  a monocycloalkane such as cyclopentane or cyclohexane; and  groups in which one or more hydrogen atoms have been  removed from a polycycloalkane such as adamantane, nor- bomane, isobornane, tricyclodecane or tetracyclododecane.  As examples of A", the same groups as those described  above for A’ in general formula (3-1) can be given. A" is  preferably an alkylene group of  1  to 5 carbon atoms, an  oxygen atom (-0-) or a sulfur atom (-S-), and more  preferably an alkylene group ofl to 5 carbon atoms or---0-.  As the alkylene group of  1  to 5 carbon atoms, a methylene  group or a dimethylethylene group is preferable, and a meth- ylene group is particularly desirable.  R $^{29 }$is the same as defined for R$^{29 }$in the aforementioned  general formula (a2-0).  In formula (a2-1), s" is preferably  1  or 2.  Specific examples of structural units represented by gen- era! formulas (a2-1) to (a2-5) are shown below. In the formu- las shown below, R"’ represents a hydrogen atom, a methyl  group or a trifluoromethyl group.  [Chemical Formula 64]  (a2-1-1)  Ra  ~61  04  0  (a2-1-7)  Ra  ~(1  04  (a2-1-6)  Ra  ~ct  04  (a2-1-5)  Ra  ~61  04  0  (a2-1-4)  Ra  ~ct  04  )j  (a2-1-3)  Ra  ~ct  04  (a2-1-2)  Ra  ~ct  04  0 