Patent ID: 8470859

Claim:
A compound represented by the formula wherein R 1a is a benzyl group optionally having 1 to 3 substituents selected from (i) a halogen atom, (ii) a C 1-6 alkoxy group optionally substituted by halogen atom(s), (iii) a C 1-6 alkyl group optionally substituted by halogen atom(s), (iv) an aminosulfonyl group, (v) a di-N,N-C 1-6 alkylaminosulfonyl group, (vi) a sulfonyl group optionally substituted by a C 1-3 alkyl group, (vii) a cyano group and (viii) an acyl group optionally substituted by substituent(s) selected from an amino group, a hydroxyl group and a C 1-3 alkyl group; R 2a is a hydrogen atom; R 3a is an amino group; R 4a is a hydrogen atom; R 5a is a halogen atom, a hydrogen atom, a methyl group, a cyano group or a methoxy group; and R 6a is a hydrogen atom, excluding 5-chloro-1,2-dihydro-2-imino-1-phenylmethyl-3-pyridinecarboxamide, 5-bromo-1,2-dihydro-2-imino-1-phenylmethyl-3-pyridinecarboxamide, or a salt thereof.