SERTRALINE

                    4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-naphthalone

                    4-(3,4-dichlorophenyl)-1-tetralone

SIBUTRAMINE

                    1-(4-chlorophenyl)cyclobutanecarbonitril

SILDENAFIL

                    4-amino-1-methyl-3-n-propylpyrazole-5-carboxamide

                    5-(2-ethoxyphenyl)-1methyl-3-propyl-6,7-dihydro-1h-pyrazolo pyrimidin-7-one

SOTALOL

                    4-(chloroacetyl)phenylmethane sulfonamide

                    4-(isopropylamino)phenylmethane sulfonamide 

SPARFLOXACIN 

                    6-nitro-2,3,4,5-tetrafluoro benzoic acid 

STARVUDINE

                    3’,5-dimethane sulfonyl thymidine

                    2-dexoy-3,5-epoxythymine

SULPIRIDE 

                    1-ethyl-2-aminmethylene pyrrolidine

                    2-methoxy-5-sulfamoyl benzoic acid

SUMATRIPAN

                    4-hydrazino-n-methyl-benzene methane sulfonamide hcl

                    4(dimethyl amino)butyraldehyde dimethyl acetal