N-(4,5-dihydro-1H-imidazol-2-yl)-5-methyl-1,2,3,4-tetrahydroquinoxalin-6-amine 4,5-dihydro-1H-imidazol-2-yl-(5-methyl-1,2,3,4-tetrahydroquinoxalin-6-yl)amine