A series of thiol containing derivatives was prepared. Several of these com
pounds were found to inhibit matrix metalloproteinases 1, 3, and 9 with sel
ectivity towards 3 and 9. Compounds 15, 20, and 22 were administered to rat
s orally at 75 mu mol/kg. Drug levels of compounds 20 and 22 in the plasma
were found to exceed the IC50 values for MMP 3 and 9 four hours after admin
istration. (C) 1999 Elsevier Science Ltd. All rights reserved.