Patent ID: 8329691

Claim:
A compound represented by the formula wherein R 1b and R 2b are each a hydrocarbon group optionally having substituent(s) or a heterocyclic group optionally having substituent(s), or R 1b and R 2b optionally form, together with the nitrogen atom bonded thereto, a nitrogen-containing heterocycle optionally having substituent(s), R 3b is (1) a 5- or 6-membered aromatic or nonaromatic heterocyclic group containing, as a ring-constituting atom besides carbon atom, 1 to 4 heteroatoms selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom, and optionally having 1 to 3 C 1-6 alkyl, (2) C 6-14 aryl, (3) C 3-10 cycloalkyl, (4) C 1-6 alkyl optionally having 1 to 3 substituents selected from the group consisting of (a) hydroxy, (b) C 1-6 alkoxy, (c) C 1-6 alkylthio, (d) C 1-6 alkylsulfinyl, and (e) C 1-6 alkylsulfonyl, or (5) C 1-6 alkoxy-carbonyl, R 4 is (1) a hydrocarbon group optionally having substituent(s), (2) a heterocyclic group optionally having substituent(s), excluding a cyclic amino optionally having substituent(s), (3) mercapto optionally having a substituent, or (4) acyl, X and Y are each C or N, and ring Ab is a nitrogen-containing 6-membered ring optionally having substituent(s) in addition to R 4 , or a salt thereof, excluding N-(2-chloro-3-pyridinyl)-2-(ethylamino)-N,6-dimethyl-3-pyridinecarboxamide.