106028-58-4 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-((7-sulfo-4-((4-sulfophenyl)azo)-1-naphtalenyl)azo)-, tetralithium salt 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-((7-sulfo-4-((4-sulfophenyl)azo-1-naphthalenyl)azo)-, tetralithium salt Food Black 2, Li salt