Patent ID: 8691828

Claim:
A compound represented by the formula wherein as X and Y, (1) X is a sulfur atom, and Y is a carbon atom, or (2) X is a carbon atom, and Y is a sulfur atom; R 1 is a hydrogen atom, a hydrocarbon group optionally having substituent(s) or a heterocyclic group optionally having substituent(s), R 2 is a hydrogen atom, a halogen atom, a hydrocarbon group optionally having substituent(s), a heterocyclic group optionally having substituent(s), or acyl, R 3 is a hydrogen atom, a halogen atom, a hydrocarbon group optionally having substituent(s), a heterocyclic group optionally having substituent(s), or acyl, or R 1 and R 2 are optionally bonded to form a nitrogen-containing heterocycle optionally having substituent(s), or R 2 and R 3 are optionally bonded to form a ring optionally having substituent(s); R 4 is a heterocyclic group optionally having substituent(s); and R 5 is a hydrogen atom, a halogen atom or a hydrocarbon group optionally having substituent(s), or a salt thereof.