1-(1,3-Dihydro-3-oxo-1-isobenzofuranyl)-5-fluoro-2,4(1H,3H)-pyrimidinedione 1-PFu 1-Phthalidyl-5-fluorouracil 2,4(1H,3H)-Pyrimidinedione, 1-(1,3-dihydro-3-oxo-1-isobenzofuranyl)-5-fluoro- 81820-68-0 N(sub 1)-Phthalidyl-5-fluorouracil