the 29-3h-labeled substrate was fed to third instar tobacco hornworms ( manduca sexta ) and erythro-2-fluoro- [ 2-3h ] citrate was isolated in 0.012 % yield by ion-exchange , silica gel , and reverse-phase chromatography of the tricarboxylic acid , trimethyl ester , and trimethyl ester benzoate , respectively .
C0008857
citrate
C0040887
tricarboxylic