US 10,394,127 B2  57  58  -continued  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).  LCl-14  LCl-15  LCl-16  LCl-17  In General Formula (Al),  R  la  to R $^{13$_{a }$}$each independently represent a hydrogen atom  or a substituent.  It is preferable that from one to three members out ofR 1$_{a }$ 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.  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  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).  In a case where R 1 a to R 13 a are not a hydrogen atom, R 1 a  to R  13$_{a }$ are each preferably a linear, branched, or cyclic alkyl  group substituted with a hydroxyl group.  Za represents a single bond or a divalent linking group.  x- has the same definition as z- in General Formula  (ZI).  Specific examples ofR  la  to R  13$_{a }$ 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.  0  (Al)  R10a  R9a 