The compounds N-[[2'-[[(4,5-dimethyl-3-isoxazolyl)amino]sulfonyl]-4-(2-oxazolyl)[1,1'-bi phenyl]-2-yl]methyl]-N,3,3-trimethylbutanamide and N-(4,5-dimethyl-3-isoxazolyl)-2'-[(3,3-dimethyl-2-oxo-1-pyrrolidinyl)methy l]-4'-(2-oxazolyl)[1,1'-biphenyl]-2-sulfonamide, and salts thereof, useful as endothelin antagonists.
                            化合物N-[[2'-[[(4,5-二甲基-3-
异噁唑基)
氨基]磺酰]-4-(2-
噁唑基)[1,1'-
联苯基]-2-基]甲基]-N,3,3-三甲基丁酰胺和N-(4,5-二甲基-3-
异噁唑基)-2'-[(3,3-二甲基-2-氧-1-
吡咯烷基)甲基]-4'-(2-
噁唑基)[1,1'-
联苯基]-2-磺酰胺,及其盐,可用作内皮素拮抗剂。