Toluene-d6-2,5-diamine Dihydrochloride; 1,4-Diamino-2-methylbenzene-d6 Dihydrochloride; 1-Methyl-2,5-diaminobenzene-d6 Dihydrochloride; 2,5-Diaminotoluene-d6 Dihydrochloride; 2,5-Diaminotoluol-d6 Dihydrochloride; 2-Methyl-1,4-benzene-d6-diamine Dihydrochloride