Substituted hydroxy-anilino derivatives of cyclobutane-3,4-diones.

摘要

The compound of formula (I), wherein R<1> is straight chain alkyl, branched chain alkyl, cycloalkyl, hydroxyalkyl, fluoroalkyl, or polyfluoroalkyl; and one of R<2>, R<3> and R<4> 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.