108008-64-6 2,4(1H,3H)-Pyrimidinedione, 1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)-5-(2-fluoroethyl)- 5-(2-Fluoroethyl)-2'-fluoroarabinofuranosyluracil FEFAU Uracil, 5-(2-fluoroethyl)-2'-fluoroarabinofuranosyl-