5-Fluoropolyoxin L 50355-67-4 NSC 174504 beta-D-Allofuranuronic acid, 5-((2-amino-5-O-(aminocarbonyl)-2-deoxy-L-xylonoyl)amino)-1,5-dideoxy-1-(5-fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-