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A compound which is represented by Formula (A2),

• in Formula (A2), Ra21 and Ra22 each independently represent an alkyl group, an aryl group, or a heteroaryl group,
• Ra23, Ra24, Ra25, and Ra26 each independently represent a cyano group, an acyl group, an alkoxycarbonyl group, an alkylsulfinyl group, an arylsulfinyl group, or a heteroaryl group,
• Ra27 and Ra28 each independently represent —BRa29Ra30,
• Ra29 and Ra30 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an aryl group, a heteroaryl group, an alkoxy group, an aryloxy group, or a heteroaryloxy group,
• Ra29 and Ra30 may be bonded to each other to form a ring,
• A1a represents at least one functional group selected from a group consisting of an acid group having a pKa of 3 or lower and a Clog P value of −1.1 or higher, an anionic group obtained by dissociating one or more hydrogen atoms from the acid group, and a salt of the acid group,
• m represents an integer of 1 to 10, and
• in a case where m represents 2 or more, a plurality of A1a's may be the same as or different from each other.