Synonyms: DYE PSK 77;1,1'-BIS(4-SULFOPHENYL)-5,5'-DIHYDROXY-3,3',A-TRIMETHYLPYRAZOLO-4,4'-TRIMETHINE OXONOLE TRIPOTASSIUM SALT;1,1'-BIS(4-SULFOPHENYL)-5,5'-DIHYDROXY-A,3,3'-TRIMETHYLPYRAZOLO-4,4'-TRIMETHINE OXONOLE TRIPOTASSIUM SALT;1-P-SULFOPHENYL-3-METHYL-4-(1-METHYL-3-(1-SULFOPHENYL-3-METHYL-5-OXO-PYRAZOLIDINE-4-YLIDEN)-PROP-1-EN-1-YL)-PYRAZOLINE-5-OXIDE-TRIPOTASSIUM SALT;1,1'-Bis(4-sulfophenyl)-5,5'-dihydroxy-3,3',alpha-trimethylpyrazolo-4,4'-trimethineoxonoletripotassiumsalt;1,1''-BIS(4-SULFOPHENYL)-5,5''-DIHYDROXY-3,3'',A-TRIMETHYLPYRAZOLO-4,4''-TRIMETHINE OXONOLE TRIPOTASSIUM SALT;1,1'-Bis(4-sulfophenyl)-5,5'-dihydroxy-a,3,3'-trimethylpyrazolo-4,4'-trimethine oxonole tripotassium salt