US 9,063,416 B2  95  96  -continued  -continued  (a3-12-10)  (a3-12-11)  (a3-12-12)  [Chemical Formula 44]  (a3-12-13)  (a3-12-14)  (a3-12-15)  (a3-12-16)  (a3-12-17)  [Structural Unit Represented by General Formula (a3-13)]  In general formula ( a3- l  3 ), R is the same as defined for R  in general formula (a3-l).  P 03  represents ----C(=O)-O- or ----C(=O)-NRn- (wherein  Rn  represents a hydrogen atom or an alkyl group of  1  to 5 carbon atoms), and preferably -C(=O)-O-. The  alkyl group for  Rn  is the same alkyl group as described above  for R.  The linear hydrocarbon group for W $^{03 }$preferably has  1  to  10  carbon atoms, more preferably  1  to 5 carbon atoms, and  still more preferably  1  or 3 carbon atoms.  The linear hydrocarbon group for W$^{03 }$may have a substitu- ent (a) other than -OH, -COOR, -CN, -SO$_{2}$NH$_{2 }$ and  ----CONH$_{2}$ .  Examples of the substituent (a) include an alkyl  group of  1  to 5 carbon atoms, an aliphatic cyclic group (mono› cyclic group and polycyclic group), a fluorine atom and a  fluorinated alkyl group of  1  to 5 carbon atoms. The aliphatic  cyclic group for the substituent (a) preferably has 3 to 30  carbon atoms, more preferably 5 to 30, still more preferably 5  to 20, particularly more preferably 6 to 15, and most prefer› ably 6 to 12. As the aliphatic cyclic group, a group in which  two or more hydrogen atoms have been removed from a  monocycloalkane or a polycycloalkane such as a bicycloal› kane, tricycloalkane or tetracycloalkane can be used. Specific  examples 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 polycycloal› kane such as adamantane, norbomane, isobornane, tricyclo› decane or tetracyclododecane. 