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1. A nitrogen-containing heterocyclic compound represented by formula (I) or salt thereof:in formula (I), R1 and R2 independently represent a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C3-8 cycloalkyl group, an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterocyclic group, an optionally substituted C1-8 acyl group, an optionally substituted (1-imino)C1-8 alkyl group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a substituted sulfonyl group, a halogeno group, a cyano group or a nitro group, or
R1 and R2 bond to form an optionally substituted 5- to 8-membered ring together with the carbon atoms which bond to R1 and R2; R3 and R4 independently represent a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C3-8 cycloalkyl group, an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterorcyclic group, an optionally substituted C1-8 acyl group, an optionally substituted (1-imino)C1-8 alkyl group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a substituted sulfonyl group, a halogeno group or a cyano group, or R3 and R4 bond to form an oxo group, a thioxo group, an optionally substituted imino group or an optionally substituted exomethylene group; R5 and R6 independently represent a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C3-8 cycloalkyl group, an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterocyclic group, an optionally substituted C1-8 acyl group, an optionally substituted (1-imino)C1-8 alkyl group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a substituted sulfonyl group, a halogeno group or a cyano group, or R5 and R6 bond to form an oxo group, a thioxo group, an optionally substituted imino group or an optionally substituted exomethylene group; partial structure A1-A2 in formula (I) represents any one of the following formulas (A) to (D): in each formula, *a represents bonding to the carbon atom at position 1 of the benzene ring; *b represents bonding to the carbon atom at position 3 of the pyridine ring; *c represents bonding to the carbon atom of CR3R4; in formula (B), R7 represents a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C1-8 acyl group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a halogeno group or a cyano group; in formula (B), R8 represents a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group or an optionally substituted C1-8 acyl group; Y represents a sulfonyl group, a group represented by NR9 or a group represented by CR10R11; R9 represents a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C1-8 acyl group, an optionally substituted (1-imino)C1-8 alkyl group or an optionally substituted amino group; R10 and R11 independently represent a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C3-8 cycloalkyl group, an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterocyclic group, an optionally substituted C1-8 acyl group, an optionally substituted (1-imino)C1-8 alkyl group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a substituted sulfonyl group, a halogeno group or a cyano group, or R10 and R11 bond to form an oxo group, a thioxo group, an optionally substituted imino group or an optionally substituted exomethylene group; wherein more than one group selected from R3 to R6 and R9 optionally bond to form an optionally substituted 3- to 8-membered ring together with the carbon atoms bonded thereto, or more than one group selected from R3 to R6 and R10 to R11 optionally bond to form an optionally substituted 3- to 8-membered ring together with the carbons bonded thereto; wherein not more than one of R3 and R4, R5 and R6, or R10 and R11 bond to form an oxo group, a thioxo group, an optionally substituted imino group or an optionally substituted exomethylene group; X and X′ independently represent an optionally substituted C1-8 alkyl group, an optionally substituted C2-8 alkenyl group, an optionally substituted C2-8 alkynyl group, an optionally substituted C3-8 cycloalkyl group, an optionally substituted C4-8 cycloalkenyl group, an optionally substituted C6-10 aryl group, an optionally substituted heterocyclic group, an optionally substituted C1-8 acyl group, an optionally substituted (1-imino)C1-8 alkyl group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, a substituted sulfonyl group, a halogeno group, a cyano group or a nitro group; m represents the number of X′ and represents an integer of 0 to 2; n represents the number of X and represents an integer of 0 to 4. |
