Patent ID: 7740995

Claim:
A pyrimidine azo compound represented by the following formula (I), or a tautomer thereof: wherein in the formula (I), R 1 represents a heterocyclic group; R 2 represents a hydrogen atom or a substituent; R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulphonyl group, an arylsulphonyl group, or a sulfamoyl group; and R 3 and R 4 , R 5 and R 6 , and R 7 and R 8 may be mutually bonded to form a 5-, 6-, or 7-membered ring.