| abstract |
A (ß-D or ß-L) nucleoside of (2'R) -2'-deoxy-2'-fluoro-2'-C-methyl or a pharmaceutically acceptable salt thereof of the structure: ** Formula ** wherein the Base is a pyrimidine base represented by the following formula ** Formula ** X is O; R1 and R7 are independently H, a monophosphate, a diphosphate or a triphosphate; R3 is H and R4 is NH2 or OH. |