SYNONYMS p-Methylaminophenol sulfate; Paramethylaminophenol sulfate; Metol; 4-(Methylamino)phenol sulfate salt (2:1); p-Methylaminophenol sulfate; Armol; Elon; Genol; Graphol; Metatyl; Methyl-p-aminophenol sulfate; N-Methyl-4-hydroxyaniline hemisulfate; N-Methyl-p-aminophenol sulfate; p-(Methylamino)phenol sulfate salt (2:1); Photol; Pictol; Planetol; Rhodol; Verol; p-Methylaminophenol sulfate; Bis(4-hydroxy-N-methylanilinium) sulphate; CAS NO. 55-55-0 (hemisulfate) 1936-57-8 (sulfate) 150-75-4 (parent)