1-[4-[2-hydroxy-3-[2-(2-methoxyphenoxy)ethylamino]propoxy]carbazol-9-yl]-3-[2-(2-methoxyphenoxy)ethylamino]propan-2-ol ; N-2-Hydroxy-3-[[2-(methoxyphenoxy)ethyl]amine Carvedilol ; 1-[[9-[2-Hydroxy-3-[[2-(2-methoxyphenoxy)ethyl]amino]propyl]-9H-carbazol-4-yl]oxy]-3-[[2-(2-methoxyphenoxy)ethyl]amino]propan-2-ol ; Carvedilol Related Compound A ; Carvedilol Impurity A