Brimonidine - 5-Bromo-N-(imidazolidin-2-ylidene)quinoxalin-6-amine; 5-Bromo-N-(4,5-dihydro-1H-imidazol-2-yl)-6-quinoxalinamine; 5-Bromo-6-(2-imidazolin-2-ylamino)quinoxaline;
Brimonidine EP Impurity E-N-(5-Bromo-6-quinoxalinyl)guanidine ;2-(5-bromoquinoxalin-6-yl)guanidine;