Patent ID: 7803822

Claim:
A compound represented by the formula (I′) wherein R 1a and R 1b are each independently a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group, or an optionally substituted alkoxy, R 2 is a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group, or an optionally substituted alkoxy, R 3 is a group represented by the formula —NHCOR 4 , —NHSO 2 R 5 , —NHCON(R 6a )(R 6b ), —NHCOOR 7 or —CONHR 8 wherein R 4 and R 7 are each independently a hydrogen atom, an optionally substituted hydrocarbon group, or an optionally substituted heterocyclic group, R 5 , R 6a , R 6b and R 8 are each independently a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group, or an optionally substituted alkoxy, R 6a and R 6b are optionally bonded to each other to form an optionally substituted nitrogen-containing non-aromatic heterocycle, ring A′ is a benzene ring optionally further having substituent(s) or a 6-membered nitrogen-containing aromatic heterocycle optionally further having substituent(s), R 2 and the substituent on ring A′ other than R 3 are optionally bonded to each other to form an optionally substituted ring, R 8 and the substituent on ring A′ are optionally bonded to each other to form an optionally substituted ring, R 1a and R 2 are optionally bonded to each other to form an optionally substituted ring, R 1a and R 1b are optionally bonded to each other to form an optionally substituted nitrogen-containing non-aromatic heterocycle, provided that when ring A′ is a benzene ring optionally further having substituent(s), R 4 is not methyl, or a salt thereof.