3,3'-di-iso-propyl-6,6'-dimethylphenolsulphonephthalein, 3,3'-diisopropyl-6-6'-dimethylphenolsulfonephthalein, THYMOL BLUE TS, Thymolsulfophthalein, S NO 879, bleudethymol, Thymolsulfonephalein, 2,2'-dimethyl-5,5'-diisopropylphenolsulfophthalein, Thymolsulfonephthalein, Thymol Blue,ACS, Phenol, 4,4‘-(3H-2,1-benzoxathiol-3-ylidene)bis[5-methyl-2-(1-methylethyl)-, S,S-dioxide, s-dioxide, 3,3-Bis(4-hydroxy-5-isopropyl-2-methylphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide, Thymol blue indicator solution