Iminopyridine derivatives and use thereof

A compound represented by the formula

• wherein
• ring A- is an aromatic ring group having at least one substituent R1 and optionally further having substituent(s), R1 is a group selected from
• (1) a group represented by the formula —S(O)nR3 wherein R3 is a hydrogen atom, a hydrocarbon group optionally having substituent(s) or an amino group optionally having substituent(s), and n is an integer of 0 to 2,
• (2) a non-aromatic nitrogen-containing heterocyclic group optionally having substituent(s),
• (3) a carbamoyl group optionally having substituent(s),
• (4) an amino group substituted by carbamoyl optionally having substituent(s),
• (5) an alkoxycarbonyl group, and
• (6) an alkyl group substituted by hydroxy, and
• R2 is a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group optionally having substituent(s), an acyl group, a heterocyclic group optionally having substituent(s), an amino group optionally having substituent(s), a hydroxy group optionally having a substituent, or a mercapto group optionally having a substituent,
• provided that
• 5-chloro-1-{4-[(dimethylamino)sulfonyl]benzyl}-2-imino-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-1-[3-(1-hydroxy-1-methylethyl)benzyl]-2-imino-1,2-dihydropyridine-3-carboxamide,
• methyl 3-{[3-(aminocarbonyl)-5-chloro-2-iminopyridin-1(2H)-yl]methyl}benzoate,
• 1-[3-(aminocarbonyl)benzyl]-5-chloro-2-imino-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-1-[4-chloro-2-(methylsulfonyl)benzyl]-2-imino-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-2-imino-1-[4-(methylsulfonyl)benzyl]-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-2-imino-1-[2-methoxy-5-(methylsulfonyl)benzyl]-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-1-[2-chloro-4-(methylsulfonyl)benzyl]-2-imino-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-1-{3-chloro-5-[(methylamino)carbonyl]benzyl}-2-imino-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-1-[2-chloro-5-(methylsulfonyl)benzyl]-2-imino-1,2-dihydropyridine-3-carboxamide,
• 1-[3-(aminocarbonyl)-5-chlorobenzyl]-5-chloro-2-imino-1,2-dihydropyridine-3-carboxamide,
• 5-chloro-2-imino-1-[3-(methylsulfonyl)benzyl]-1,2-dihydropyridine-3-carboxamide, and
• 5-chloro-2-imino-1-(3-morpholin-4-ylbenzyl)-1,2-dihydropyridine-3-carboxamide are excluded, or a salt thereof.