abstract |
Compounds having the formula [Chemical formula should be inserted here. Please see paper copy] wherein R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>3</SUB>, R<SUB>6</SUB>, R<SUB>7 </SUB>and Ar are as defined in the specification, in vivo-hydrolysable precursors thereof, pharmaceutically-acceptable salts thereof, the use in therapy and pharmaceutical compositions and methods of treatment using the sam |