"Thymol blue" . . . . "\u03B1-hydroxy-\u03B1,\u03B1-bis(5-hydroxycarvacryl)- o-toluenesulfonic acid \u03B3-sultone; thymolsulfonephthalein" . . . "thymol blue" . . . . . "Thymol Blue" . "3,3-Bis[4-hydroxy-2-methyl-5-(propan-2-yl)phenyl]-2,1\u03BB6-benzoxathiole-1,1(3H)-dione" . . "Thymol blue" . . . . .