1-(5-Phospho-beta-D-arabinofuranosyl)-5-fluorouracil 17124-23-1 2,4(1H,3H)-Pyrimidinedione, 5-fluoro-1-(5-O-phosphono-beta-D-arabinofuranosyl)- 5-Fluorouracil arabinonucleoside 5'-phosphate Ara-fump