| abstract |
A compound represented by the following formula (I) or a salt thereof: n n nwherein R 1 and R 2 represent an alkyl group or an aryl group; R 3 to R 6 represent hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a halogen atom, cyano group, carboxyl group or sulfo group; X 1 and X 2 represent an alkyl group having 1 to 15 carbon atoms or an aryl group, and the total number of carboxyl groups existing in X 1 and X 2 is 4 or less; m 1 to m 3 represents 0 or 1; L 1 to L 7 represent a methine group; M represents hydrogen atom, a metal or a quaternary ammonium salt; Y represents nonmetallic elements required to form a 5- to 10-membered heterocyclic ring; and n represents an integer of 1 to 7 required to neutralize charge, which is useful for manufacture of silver halide photographic light-sensitive materials. |