1,3-bis(9H-carbazol-4-yloxy)propan-2-ol; Carvedilol Diether Propanol Impurity; 1,3-Bis(9H-carbazol-4-yloxy)-2-propanol; 1,3-Bis(9H-carbazol-4-yloxy)propan-2-ol; 2-Propanol, 1,3-bis(9H-carbazol-4-yloxy)