Acid Red 2METHYL RED, ACS4-Dimethylaminoazobenzene-2'-carboxylic acid hydrochlorideMethyl Red hydrochloride4-二甲氨基偶氮苯-2′-羧酸 盐酸盐甲基红 盐酸盐酸性红 24-Dimethylaminoazobenzene-2′-carboxylic acid hydrochloride甲基红 盐酸盐, ACSMethyl Red hydrochloride, ACS2-[4-(Dimethylamino)phenyl]azobenzoic acid