Polymerizable compound, polymerizable composition, polymer, and optically anisotropic material

A hydrazine compound represented by a formula (3)

• wherein Ax is an organic group having 2 to 30 carbon atoms that includes at least one aromatic ring selected from a group consisting of an aromatic hydrocarbon ring, a pyrrole ring, a furan ring, a thiophene ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a pyrazole ring, an imidazole ring, an oxazole ring, a thiazole ring, a benzoxazole ring, a quinoline ring, a benzimidazole ring, a benzopyrazole ring, a benzofuran ring, and a benzothiophene ring, and
• Ay is an alkyl group having 5 to 20 carbon atoms that is optionally substituted with halogen atoms, substituted amino groups, alkoxy groups having 1 to 6 carbon atoms, alkoxy groups having 1 to 6 carbon atoms that are substituted with an alkoxy group having 1 to 6 carbon atoms, a nitro group, aryl groups, cycloalkyl groups having 3 to 8 carbon atoms, —C(═O)—R4;
• —C(═O)—OR4;
• —S02R4, a hydroxyl group, where R4 is an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 14 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, —C(═O)—R3, or —SO2—R6, provided that
• the aromatic ring included in Ax is substituted or unsubstituted, and
• Ax and Ay optionally bond to each other to form a ring, R3 is a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 12 carbon atoms, R6 is an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a phenyl group, or a 4-methylphenyl group.