Calcium 3-hydroxy-4-[[1-(sulfonatomethyl)-2-naphthyl]azo]-2-naphthoate

2-naphthalenecarboxylicacid, 3-hydroxy-4-[[1-(sulfomethyl)-2-naphthalenyl]azo]-, calcium salt (1:1)(9ci) ; calcium 3-hydroxy-4-[[1-(sulphonatomethyl)-2-naphthyl]azo]-2-naphthoate ; 2-naphthalenecarboxylicacid, 3-hydroxy-4-[2-[1-(sulfomethyl)-2-naphthalenyl]diazenyl]-, calcium salt(1:1) ; 2-naphthoic acid, 3-hydroxy-4-[[1-(sulfomethyl)-2-naphthyl]azo]-,calcium salt (1:1) (8ci) ; calcium 3-hydroxy-4-[[1-(sulfonatomethyl)-2-naphthyl]azo]-2-naphthoate