A compound represented by general formula (I) below, or a pharmacologically acceptable salt thereof:
wherein X represents sulfonic acid group or phosphoric acid group; R
1
and R
2
represent substituents; R
3
to R
6
represent optionally substituted alkyl groups; R
7
and R
8
represent optionally substituted alkyl groups; L
1
to L
3
represent optionally substituted methine groups; r represents an integer of from 0 to 3, and when r is 2 or more, the plural L
2
and the plural L
3
may be the same or different, respectively; each of m and n represent integers of 0 to 3; at least one of the substituents is an acid group selected from sulfonic acid group, carboxylic acid group, and phosphonic acid group or a group comprising the acid group; and two or more of the acid groups and X are selected from carboxylic acid group and phosphonic acid group.