as well as the already known metabolites , unmetabolized 5'-dfurd , 5-fluorouracil , and 5,6-dihydro-5-fluorouracil , the presence of alpha-fluoro-beta-ureidopropionic acid , alpha-fluoro-beta-alanine ( fbal ) , n-carboxy-alpha-fluoro-beta-alanine , and the fluoride anion f- is reported .
C0003075
anion
C0016327
f