FAMCICLOVIR

                    2-amino-6-hydroxypurine

                    6-chloropurine 

                    2,6-dichloropurine

                    2-amino-6-chloropurine

                    9-(4-acetoxy-3-acetoxymethylbut-1-yl)-2-amino-6-chloropurine

FELODIPINE

                    2,3-dichlorobenzaldehyde

FENOFIBRATE

                    4-chloro-4'-hydroxybenzophenone

                    2-[4-(p-chlorobenzoyl) phenoxy]-2'-methyl-propionue acid

FINASTERIDE

                    androst-3-one-4-ene-17b-carboxylic acid

                    androst-4-aza-3-one-17b-butyl carboxamide

                    3-oxo-4-aza-5a-androstane-17b-carboxylic acid

FIPRONIL

                    2,6-dichloro-4-trifluoromethyl aniline

FLECAINIDE

                    2,5-bis-(2,2,2-trifluoroethoxy)benzoic acid

FLUCONAZOLE

                    2,4-difluoro-a-(1h-1,2,4-triazol-1yl) acetophenone

FLUNARIZINE

                    n-mono-[4,4'-fluorobenzyl] methyl piperazine

FLUOROURACIL

                    2-mercapto-4-hydroxy-5-fluoropyrimidine

FLUOXETINE

                    3-methylamino-1-phenyl-propanol

                    3-hydroxy-n-methyl-3-phenyl propylamine

FLURAEPAM

                    2-amino-5-chloro-2'-fluorobenzophenone

FLURAZOPAN

                    2-amino-5-chloro-2’-fluorobenzophenone

                    7-chloro-5-(2-fluorophenyl)1,3-dihydro-1,4-benzodiazepine-2-one 

FLURBIPROFEN 

                    2-fluoro-4-bromo biphenyl

                    2,4-difluoro nitro benzene 

FLUROBENDAZOLE

                    4-chloro-4’-fluoro-3-nitrobenzophenone

FLUTAMIDE 

                    3-trifluoromethyl-4-nitro aniline

FORMOTEROL

                    3-nitro-4-hydroxyacetophenone

FUROSEMIDE

                    2,4-dichloro-5-sulfamide benzoic acid

                    2,4-dichloro-5-aminosulfomylbenzoic acid

              2-amino-4-chloro-5-aminosulfomyl benzoic acid