Synonyms: Cobaltate(1-),bis[4-hydroxy-3-[(5-hydroxynaphth[2,1-d]-1,3-oxathiol-4-yl)azo]-N-methylbenzenesulfonamideS,S-dioxidato(2-)]-, sodium; Benzenesulfonamide,4-hydroxy-3-[(5-hydroxynaphth[2,1-d]-1,3-oxathiol-4-yl)azo]-N-methyl-,S,S-dioxide, cobalt complex; Naphth[2,1-d]-1,3-oxathiole, benzenesulfonamidederiv., cobalt complex; Naphth[2,1-d]-1,3-oxathiole, cobaltate(1-) deriv.