Patent ID: 8470054

Claim:
An azo compound represented by the following formula (1), a tautomer thereof, and a salt or hydrate of the azo compound or the tautomer: wherein in the formula (1), A represents a heterocyclic group; G represents a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R 1 and R 2 each independently represent a group represented by the following formula (2) or (3): wherein R 3 represents an amino group, an aliphatic oxy group, an aliphatic group, an aromatic group, an aromatic oxy group, or a heterocyclic group; X 1 represents —O—, —S—, —NR— or —N═; R represents a hydrogen atom or an aliphatic group; Y represents a divalent group which forms a heterocyclic ring together with the nitrogen atom and X 1 ; R 11 represents a substituent, and when there are plural R 11 's, R 11 's may be identical with or different from each other; * represents a bond that is bonded to the naphthalene ring in the formula (1); and m's each independently represent an integer of 0 to 4.