Nicardipine EP Impurity B DiHCl; Nimodipine Impurity 19; Nicardipine Impurity 2 DiHCl; bis(2-(benzyl(methyl)amino)ethyl) 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate hydrochloride; Nicardipine Impurity90; Nicardipine EP Impurity B; Nicardipine Bis Analog Dihydrochloride