9-(4'-Phosphonomethoxy-2'-cyclopenten-1'-yl)hypoxanthine and 9-(4'-phosphonomethoxy-2',3'-dihydroxycyclopenten-1'-yl)hypoxanthine were synthesized as isosteric carbocyclic analogues of inosine-5'-monophosphate. The synthesized compounds were shown to be capable of inhibiting the activity of human type II inosine-5'-monophosphate dehydrogenase (IMPDH II) (IC(50 )= 500 µM) and to have no significant effects on the growth ofMycobacterium tuberculosis.
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