Endothelin-Rezeptor-Antagonisten

摘要

The invention relates to novel compounds of formula I wherein X represents O or S, R<3> represents COOR<4>, CN, 1H-tetrazol-5-yl or CONHSO2R<5>, and at least one of R<2> or R<2'> means a substituent. Said compounds display endothelin receptor antagonistic properties.