The invention relates to the compound of structural formula Iand the salts thereof.Said compound is useful as endothelin receptor antagonist.The invention further relates to a process for preparing said compound.本發明係關於一種結構式I之化合物及其鹽該化合物係作為内皮素受體拮抗劑。本發明進一步係關於一種製備該化合物之方法。