group (an aryl group or a heteroaryl group) formed by removing one hydrogen atom from the aromatic hydrocar› bon ring or aromatic hetero ring has been substituted with an alkylene group. The number of carbon atoms in the alkylene group which is bonded to the above-described aryl group or heteroaryl group is preferably in a range of 1 to 4, more preferably 1 or 2, and particularly preferably 1 carbon atom. 

[0056] The divalent hydrocarbon group may have a sub› stituent. 

[0057] The linear or branched aliphatic hydrocarbon group serving as a divalent hydrocarbon group may or may not have a substituent. Examples of the substituent include a fluorine atom, a fluorinated alkyl group having 1 to 5 carbon atoms which has been substituted with a fluorine atom, and a carbonyl group. 

[0058] The alicyclic hydrocarbon group in an aliphatic hydrocarbon group having a ring in the structure thereof, as the divalent hydrocarbon group, may or may not have a substituent. Examples of the substituent include an alkyl group, an alkoxy group, a halogen atom, a halogenated alkyl group, a hydroxyl group, and a carbonyl group. 

[0059] As the alkyl group serving as the substituent, an alkyl group having 1 to 5 carbon atoms is preferable, and a methyl group, an ethyl group, a propyl group, an n-butyl group, or a tert-butyl group is most preferable. 

[0060] As the alkoxy group serving as the substituent, an alkoxy group having 1 to 5 carbon atoms is preferable, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, or a tert-butoxy group is preferable, and a methoxy group or an ethoxy group is most preferable. 

[0061] Examples of the halogen atom serving as the substituent include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Among these, a fluorine atom is preferable. 

[0062] Examples of the halogenated alkyl group serving as the substituent include a group in which part or all of the hydrogen atoms in the alkyl group have been substituted with halogen atoms. 

[0063] In the alicyclic hydrocarbon group, part of the carbon atoms constituting the ring structure thereof may be substituted with a substituent containing a hetero atom. As the substituent containing a hetero atom, ---0-, -C(=O)---0-, -S-, -S(=O) 2 -, or -S(=O) 2 - O- is preferable. 

[0064] In the aromatic hydrocarbon group serving as a divalent hydrocarbon group, a hydrogen atom in the aro› matic hydrocarbon group may be substituted with a sub› stituent. For example, the hydrogen atom bonded to the aromatic ring in the aromatic hydrocarbon group may be substituted with a substituent. Examples of the substituent include an alkyl group, an alkoxy group, a halogen atom, a halogenated alkyl group, and a hydroxyl group. 

[0065] As the alkyl group serving as the substituent, an alkyl group having 1 to 5 carbon atoms is preferable, and a methyl group, an ethyl group, a propyl group, an n-butyl group, or a tert-butyl group is most preferable. 

[0066] Examples of the alkoxy group, the halogen atom, and the halogenated alkyl group serving as the substituents are the same as those exemplified as the substituents for substituting a hydrogen atom in the alicyclic hydrocarbon group. 

[0067] In regard to divalent linking group having hetero atom: 

[0068] The hetero atom in the divalent linking group having a hetero atom is an atom other than a carbon atom and a hydrogen atom, and examples thereof include an oxygen atom, a nitrogen atom, a sulfur atom, and a halogen atom. 

[0069] In the examples of the divalent linking group having a heteroatom, preferred examples of the linking group include -0-, ----C(=O)-O-, ----C(=O)-, or ---0-C(=O)-O-; -C(=O)-NH-, -NH-, -NH-C(=O)-O-, or -NH-C( NH)- (H may be substituted with a substituent such as an alkyl group, an acyl group, or the like);-S-, -S(=O) 2 -, -S(=O) 2 ---0-, and a group represented by Formula -Y 21 -O-Y 22 -, _y21_O-, _y21----C(=O)---O-, -C(=O)-O› y21_, [Y21----C(=O)-Olm"_y22_, or _y21_ O ----C (=O)-Y 22 - [in the formulae, Y 21 and Y 22 each indepen› dently represent a divalent hydrocarbon group which may have a substituent, 0 represents an oxygen atom, and m" represents an integer of Oto 3]. 

[0070] In a case where the divalent linking group contain› ing a hetero atom is -C(=O)-NH-, -NH-, -NH› C(=O)-O-, or -NH----C( NH)-, H may be substi› tuted with a substituent such as an alkyl group, an acyl group, or the like. The substituent (an alkyl group, an acyl group, or the like) preferably has 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms, and particularly preferably 1 to 5 carbon atoms. 21 22 21 

[0071] In Formulae -Y ---0-Y _, _y ---0-, _y21_C(=O)-O-, -C(=)---O-Y21_, -[Y21----C (=O)-OJm,,_/2-, or _y21---0-C(=O)-Y22_, y21 and Y 22 each independently represent a divalent hydrocar› bon group which may have a substituent. Examples of the divalent hydrocarbon group include the same groups as those described above as the "divalent hydrocarbon group which may have a substituent" in the explanation of the above-described divalent linking group. 21 

[0072] As Y , a linear aliphatic hydrocarbon group is preferable, a linear alkylene group is more preferable, a linear alkylene group having 1 to 5 carbon atoms is still more preferable, and a methylene group or an ethylene group is particularly preferable. 22 

[0073] As Y , a linear or branched aliphatic hydrocarbon group is preferable, and a methylene group, an ethylene group, or an alkylmethylene group is more preferable. The alkyl group in the alkylmethylene group is preferably a linear alkyl group having 1 to 5 carbon atoms, more pref› erably a linear alkyl group having 1 to 3 carbon atoms, and most preferably a methyl group. 21 

[0074] In the group represented by Formula -[Y ----C (=O)-OJm,,-Y 22 -, m" represents an integer of Oto 3, preferably an integer of O to 2, more preferably O or 1, and particularly preferably 1. In other words, it is particularly preferable that the group represented by Formula -[Y 21 - C(=O)-OJm,,-Y22- be a group represented by Formula -Y$^{21}$-C(=O)-O-Y 22 -. Among these, a group repre› sented by Formula -(CH 2 )a,----C(=O)---O-(CH 2 )$_{6}$ ,- is preferable. In the formula, a’ represents an integer of 1 to 10, preferably an integer of 1 to 8, more preferably an integer of 1 to 5, still more preferably 1 or 2, and most preferably 1. b’ represents an integer of 1 to 10, preferably an integer of 1 to 8, more preferably an integer of 1 to 5, still more preferably 1 or 2, and most preferably 1. 

