2-propanol, 1,1'-[[2-(2-methoxyphenoxy)ethyl]imino]bis[3-(9h-carbazol-4-yloxy)- ; carvedilol impurity-b(ep) ; carvedilol related compound b (15 mg) (3,3'-(2-(2-methoxyphenoxy)ethylazanediyl)bis(1-(9h-carbazol-4-yloxy)propan-2-ol)) ; carvedilol related compound b (usp) ; 1,1'-[[2-(2-methoxyphenoxy)ethyl]imino]bis[3-(9h-carbazol-4-yloxy)-2-propanol ; carvedilol impurity b (pheur) ; carvedilol bis-carbazole ; carvedilol ep impurity b ; carvedilol related compound b