Polymerizable compound, polymerizable composition, polymer, optically anisotropic body, and method for producing polymerizable compound

A carbonyl compound represented by a formula (4),

• wherein Y1 to Y8 are independently a chemical single bond, —O—, —S—, —O—C(═O)—, —C(═O)—O—, —O—C(═O)—O—, —NR1—C(═O)—, —C(═O)—NR1—, —O—C(═O)—NR1—, —NR1—C(═O)—O—, —NR1—C(═O)—NR1—, —O—NR1—, or —NR1—O—, R1 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
• G1 and G2 are independently a substituted or unsubstituted divalent linear aliphatic group having 1 to 20 carbon atoms that optionally includes —O—, —S—, —O—C(═O)—, —C(═O)—O—, —O—C(═O)—O—, —NR2—C(═O)—, —C(═O)—NR2—, —NR2—, or —C(═O)—, provided that a case where the aliphatic group includes two or more contiguous —O— or —S— is excluded, R2 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
• Z1 and Z2 are independently an alkenyl group having 2 to 10 carbon atoms that is unsubstituted, or substituted with a halogen atom,
• A1 is a substituted or unsubstituted trivalent aromatic group,
• A2 and A3 are independently a substituted or unsubstituted divalent alicyclic hydrocarbon group having 3 to 30 carbon atoms,
• A4 and A5 are independently a substituted or unsubstituted divalent aromatic group having 6 to 30 carbon atoms, and
• Q1 is a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.