4-(1-hydroxy-2-methylpropan-2-yl)-N-(6-(2-hydroxyethoxy)-5-(2-hydroxyphenoxy)-[2,2'-bipyrimidin]-4-yl)benzenesulfonamide; 4-(2-Hydroxy-1,1-dimethylethyl)-N-[6-(2-hydroxyethoxy)-5-(2-hydroxyphenoxy)[2,2'-bipyrimidin]-4-yl]benzenesulfonamide; Bosentan Hydroxymethyl O-Desmethyl Impurity
