Also Called: Cobaltate(1-), bis[4-hydroxy-3-[(2-hydroxy- 1-naphthalenyl)azo]-N-methylbenzenesulfonamidato (2-)]-, sodium;Cobaltate(1-), bis[4-hydroxy-3-[(2-hydroxy-1-naphthalenyl)azo]-N-methylbenzenesulfonamidato(2-)]-, sodium;Cobalt and cobalt compounds