{4-[4-(4-bromo-phenylsulfamoyl)-2-nitro-phenylsulfanyl]-phenyl}-carbamic acid tert-butyl ester

{4-[4-(4-bromo-phenylsulfamoyl)-2-(7-isopropyl-pyrido[2,3-d]pyrimidin-4-ylamino)-phenylsulfanyl]-phenyl}-carbamic acid tert-butyl ester

{4-[2-amino-4-(4-bromo-phenylsulfamoyl)-phenylsulfanyl]-phenyl}-carbamic acid tert-butyl ester