Synonyms: 1-(2'-Hydroxy-m-terphenyl-5'-yl)-2,4,6-triphenylpyridiniumhydroxide, inner salt (7CI); Pyridinium,1-(3,5-diphenyl-4-hydroxyphenyl)-2,4,6-triphenyl-, hydroxide, inner salt (8CI);1-(2'-Hydroxy[1,1':3',1''-terphenyl]-5'-yl)-2,4,6-triphenylpyridinium hydroxideinner salt; 2,6-Diphenyl-4-(2,4,6-triphenyl-1-pyridinio)phenolate; 2,6-Diphenyl-4-(2,4,6-triphenyl-1-pyridinio)phenoxide;2,6-Diphenyl-4-(2,4,6-triphenylpyridinium-1-yl)phenolate;2,6-Diphenyl-4-(2',4',6'-triphenyl-1-pyridinium)phenolate;4-(2,4,6-Triphenylpyridinio)-2,6-diphenylphenoxide;4-(2,4,6-Triphenylpyridinium-1-yl)-2,6-diphenylphenolate; Betaine 30;Dimroth-Reichardt betaine dye; ET 30; Reichardt's ET(30) betaine dye;Reichardt's betain; Reichardt's dye; Reichard's ET 30 dye