Chlorosulfonyl Isocyanate (CSI)

2-Azabicyclo[2.2.1]hept-5-en-3-one

2-Amino-4,6-dichloro-5-formamidopyrimidine

5-Fluorouracil

(S)-4-chloro-3-hydroxybutyronitrile

(R)-4-cyano-3-hydroxy ethylbutyrate

5-Fluorocytosine

4- (1-hydroxy-1-methylethyl) -2-propyl-1H-Imidazole-5-carboxylic acid ethyl ester

Fluorointermediate