the concentration of 5-fu in blood was less than 0.02 microgram/ml with all combinations of ft-207 and uracil except high molar ratios of uracil to ft-207 ( ratio , 5 and 10 ) , whereas high concentrations of up to a maximum of 0.200 microgram/g on administration of uracil plus 5 or 7.5 mg/kg of ft-207 ( ratio , 4 ) , was found in the tumor .
C0016360
fu
C0041917
uracil