2(1H)-Pyrimidinone, 4-amino-1-(5-O-(hydroxymethylphosphinyl)-beta-D-arabinofuranosyl)- 4-Amino-1-(5-O-(hydroxymethylphosphinyl)-beta-D-arabinofuranosyl)-2(1H)-pyrimidinone 53220-20-5 Ara-C-5'-methylphosphonate Cytarabine 5'-methylphosphonate