| Cpds | 
        X | 
        Y | 
        MW | 
        OBAV, % | 
        cLogPb | 
       
      
        | 2.8 | 
        NA | 
        NA | 
        354.7 | 
        1 | 
        -0.73 | 
       
      
        | 5.1 | 
        Ph | 
        H | 
        470.9 | 
        0 | 
        5.25 | 
       
      
        | 5.2 | 
        4-F-Ph | 
        H | 
        488.9 | 
        2 | 
        5.30 | 
       
      
        | 5.3 | 
        3-Br-4-MeO-Ph | 
        H | 
        579.8 | 
        0 | 
        5.74 | 
       
      
        | 5.4 | 
        3-furyl | 
        H | 
        460.8 | 
        0 | 
        4.41 | 
       
      
        | 5.5 | 
        4-pyridyl | 
        H | 
        471.9 | 
        12 | 
        3.76 | 
       
      
        | 5.6 | 
        2-pyridyl | 
        H | 
        471.9 | 
        6 | 
        3.76 | 
       
      
        | 5.7 | 
        H | 
        CH2OH | 
        424.8 | 
        11 | 
        2.67 | 
       
      
        | 5.8 | 
        H | 
        CH2OAc | 
        466.9 | 
        10 | 
        3.57 | 
       
      
        | 5.9 | 
        H | 
        CH2OCO2Me | 
        482.9 | 
        14 | 
        3.54 | 
       
      
        | 5.10 | 
        H | 
        CH2N3 | 
        449.8 | 
        13 | 
        3.58 | 
       
      
        | 5.11 | 
        H | 
        CH2NH2 | 
        423.8 | 
        4 | 
        2.72 | 
       
     
      aOBAV determined by measuring urinary excretion of 2.8 following oral
    administration of the prodrug vs i.v. administration of 2.8; bADME Boxes version
    3.5 (Pharma Algorithm, Toronto, Canada) was used |