N-(4,5-Dihydro-1H-iMidazol-2-yl)-6-quinoxalinaMine;Brimonidine Impurity A;Brimonidine EP Impurity A;Brimonidine EP Impurity A (Brimonidine Impurity II);Debromo Brimonidine;Brimonidine Impurity 3;Brimonidine EP Imp A;Brimonidine Impurity 1 (Brimonidine EP Impurity A)