2-[[4-(dimethylamino)phenyl]azo]benzoic acid monohydrochloride;Methyl Red hydrochloride;METHYL RED HYDROCHLORIDE GR ACS;2-[[4-(dimethylamino)phenyl]diazenyl]benzoic acid,hydrochloride;Methyl Red hydrochloride, ACS;Methyl Red hydrochloride, ACS reagent;Methyl Red hydrochloride, conform to ACS, pure