for the following products
Bosentan usp related compound a | N-[6-Chloro-5-(2-methoxyphenoxy) [2,2'-bipyrimidin]-4-yl]-4-1,1-dimethylethyl)benzene sulfonamide and 4-tert-Butyl-N-[6-chloro-5-(2-methoxy-phenoxy)-[2,2']bipyrimidinyl-4-yl]-benzenesulfonamide
