2-Naphthalenecarboxylic acid, 3-hydroxy-4-((6-sulfo-2-naphthalenyl)azo)-, manganese(2+) salt (1:1) 3-Hydroxy-4-((6-sulfo-2-naphthyl)azo)-2-naphthalenecarboxylic acid,manganese salt (1:1) 73019-26-8