Calconcarboxylic acid, 2,2'-dihydroxy-4'-sulfo-1,1'-azonaphthalene-3-carboxylic acid, 3-hydroxy-4(2-hydroxy-4-sulfo-1-naphthyl-azo)-2-naphthalenecarboxylic acid; 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid; HHSNN; 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid,indicator grade; Calcon-carboxylic Acid; CAL-RED(R); Patton and Reeder’s; Patton and Reeder Dye; HHSNNA; CAL RED; Calconcarboxylic aci; 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]naphthalene-2-carboxylic acid; CalconCarboxylicAcidGr; 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid; Kalces;