申请人:Sadamitsu Yuichi
公开号:US20090174942A1
公开(公告)日:2009-07-09
Disclosed is an azo compound represented by the formula (1) or (2) below, or a salt thereof.
(In the formulae, A represents a substituted phenyl group or a naphthyl group having 1-3 sulfonic acid groups; X represents —N═N— or —NHCO—; R
1
-R
4
independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; m represents a number of 1-3; and n represents 0 or 1.)