Chemical structures of cytidine analogs which are FDA-approved drugs,
cytatabine, azacytidine, decitabine, and gemcitabine, and investigational
agents, 4’-thio-2’-deoxycytidine (T-dCyd),
5-aza-4’-thio-2’-deoxycytidine (aza-T-dCyd), and fluorine
containing cytidine compounds, RX-3117 F-T-dCyd (FF-10502) and F-aza-T-dCyd
(NSC801845).