Synonyms: 1,3,3-trimethyl-2-[(methyl-2-naphthylhydrazono)methyl]-3H-indolium chloride;1,3,3-trimethyl-2-[(methyl-2-naphthalenylhydrazono)methyl]-3h-indoliu chloride;3H-Indolium, 1,3,3-trimethyl-2-[(methyl-2-naphthalenylhydrazono)methyl]-, chloride;3H-Indolium,1,3,3-trimethyl-2-[(methyl-2-naphthalenylhydrazono)methyl]-,chloride