.beta.-L-Cytidine, 2',3'-didehydro-2',3'-dideoxy-3'-fluoro- 2(1H)-Pyrimidinone, 4-amino-1-[(2R,5R)-4-fluoro-2,5-dihydro-5-(hydroxymethyl)-2-furanyl]- AIDS-027824 AIDS027824 L-3'-F-D4C L-3'-Fluoro-2',3'-dideoxydidehydrocytidine