SUBSTITUTED HYDROXY-ANILINO DERIVATIVES OF CYCLOBUTENE-3,4-DIONES

摘要

The compound of formula (I), wherein R1 is straight chain alkyl, branched chain alkyl, cycloalkyl, hydroxyalkyl, fluoroalkyl, or polyfluoroalkyl; and one of R?2, R3 and R4¿ is hydroxyl and the other two are, independently, H, CN, halogen, alkyl or hydroxyl; or a pharmaceutically acceptable salt thereof, is useful as a smooth muscle relaxant.