134379-77-4 2',3'-Didehydro-2',3'-dideoxy-5-fluorocytidine 2',3'-Dideoxy-2',3'-didehydro-5-fluorocytidine 2',3'-Dideoxy-2',3'-didehydro-beta-L-5-fluorocytidine Cytidine, 2',3'-didehydro-2',3'-dideoxy-5-fluoro- D-d4FC RA 131423 Reverset