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netLibrary - eBook Summary Structure-based Drug Design by ...

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Table 1 Inhibition Data for Selected PNP Inhibitors <strong>by</strong> Increasing IC 50 Value<br />

R 2a<br />

R 2<br />

IC 50, μM Ratio d<br />

50 mM<br />

phosphate b<br />

1 mM<br />

phosphate c<br />

(S)-3-Chlorophenyl CH 2CO 2H 0.031 0.0059 5.3<br />

3-Chlorophenyl CH 2CN 1.8 0.010 180<br />

2-Tetrehydrothienyl H 0.22 0.011 20<br />

3,4-Dichlorophenyl H 0.25 0.012 21<br />

3-Thienyl H 0.08 0.020 4<br />

3-Trifluoromethylcyclohexyl H 0.74 0.020 37<br />

Cyclopentyl H 1.8 0.029 62<br />

Cycloheptyl H 0.86 0.030 29<br />

Pyridin-3-yl H 0.20 0.030 7.3<br />

2-(Phosphonoethyl)phenyl e H 0.45 0.035 13<br />

Cyclohexyl H 2.0 0.043 47<br />

2-Furanyl H 0.31 0.085 3.6<br />

(R)-3-Chlorophenyl CH 2CO 2H 0.90 0.16 5.6<br />

2-Phosphonopropoxyphenyl e H 42 1.0 42<br />

a Compounds with R2 not equal to H are racemic mixtures unless the R or S isomer is designated.<br />

b Calf spleen PNP assayed in 50 mM phosphate buffer.<br />

c Calf spleen PNP assayed in 1 mM phosphate buffer.<br />

d IC50 at 50 mM phosphate divided <strong>by</strong> IC 50 at 1 mM phosphate.<br />

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