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The cyclic organic group may have a substituent, and examples of the substituent include an alkyl group (may be in any one of linear, branched, and cyclic forms; preferably having 1 to 12 carbon atoms), a cycloalkyl group (may be in any one of monocyclic, polycyclic, and spirocyclic forms; preferably having 3 to 20 carbon atoms), an aryl group (preferably having 6 to 14 carbon atoms), a hydroxy group, an alkoxy group, an ester group, an amido group, a urethane group, a ureido group, a thioether group, a sulfonamido group, and a sulfonic acid ester group. Incidentally, the carbon constituting the cyclic organic group (the carbon contributing to ring formation) may be a carbonyl carbon. 

Examples of the organic group of R$_{201}$, R 202 , and R 203 include an aryl group, an alkyl group, and a cycloalkyl group. 

At least one of three members R$_{20}$i, $^{R}$202, or R 203 is preferably an aryl group, and it is more preferable that all of these three members are an aryl group. The aryl group may be a heteroaryl group such as indole residue and pyrrole residue, other than a phenyl group, a naphthyl group and the like. The alkyl group and the cycloalkyl group of R$_{201 }$ to R$_{203 }$ may be preferably a linear or branched alkyl group having 1 to 10 carbon atoms and a cycloalkyl group having 3 to 10 carbon atoms. More preferred examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, and an n-butyl group. More preferred examples of the cycloalkyl group include a cyclo› propyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. These groups may further have a substituent, and examples of the sub- stituent include, but are not limited to, a nitro group, a halogen atom such as 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 having 6 to 14 carbon atoms), an alkoxy› carbonyl group (preferably having 2 to 7 carbon atoms), an 

-continued 

LCl-14 

LCl-15 

LCl-16 

LCl-17 

acyl group (preferably having 2 to 12 carbon atoms), and an alkoxycarbonyloxy group (preferably having 2 to 7 carbon atoms). 

Moreover, in a case where two members out of R$_{201 }$ to R$_{203 }$ are bonded to form a ring structure, the ring structure is preferably a structure represented by General Formula (Al). 

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In General Formula (Al), 

R la to R $^{13$_{a }$}$each independently represent a hydrogen atom or a substituent. 1$_{a }$ 

It is preferable that from one to three members out ofR to R 13$_{a }$ are not a hydrogen atom; and it is more preferable that any one of R 9 a to R 13$_{a }$ is not a hydrogen atom. 

Za represents a single bond or a divalent linking group. 

x- has the same definition as z- in General Formula (ZI). 13$_{a }$ 

Specific examples ofR la to R in a case where these are not each a hydrogen atom include a halogen atom, a linear, branched, or cyclic alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, a cyano group, a nitro group, a carboxyl group, an alkoxy group, an aryloxy group, a silyloxy group, a heterocyclic oxy group, an acy- loxy group, a carbamoyloxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an amino group (in› cluding an anilino group), an ammonia group, an acylamino group, an aminocarbonylamino group, an alkoxycarbo› nylamino group, an aryloxycarbonylamino group, a sulfa- moylamino group, alkyl and arylsulfonylamino groups, a mercapto group, an alkylthio group, an arylthio group, a heterocyclic thio group, a sulfamoyl group, a sulfa group, alkyl- and arylsulfinyl groups, alkyl- and arylsulfonyl groups, an acyl group, an aryloxycarbonyl group, an alkoxy- carbonyl group, a carbamoyl group, aryl- and heterocyclic azo groups, an imido group, a phosphino group, a phosphi› nyl group, a phosphinyloxy group, a phosphinylamino group, a phosphono group, a silyl group, a hydrazino group, a ureido group, a boronic acid group (-B(OH)$_{2}$ ), a phos- phato group (-OPO(OH)$_{2}$), a sulfato group (-OSO $_{3}$H), and other known substituents. 1 13 1 

In a case where R a to R a are not a hydrogen atom, R a to R 13$_{a }$ are each preferably a linear, branched, or cyclic alkyl group substituted with a hydroxyl group. 

Examples of the divalent linking group of Za include an alkylene group, an arylene group, a carbonyl group, a sulfonyl group, a carbonyloxy group, a carbonylamino group, a sulfonylamido group, an ether bond, a thioether bond, an amino group, a disulfide group, -(CH$_{2}$)n----CO-, -(CH$_{2}$)n-SO$_{2}$-, ----CH=CH-, an aminocarbonylamino group, and an aminosulfonylamino group (n is an integer of 1 to 3). 

