4-CYCLOHEXYL-3-THIOSEMICARBAZIDE

4-CYCLOPROPYL-6-(METHYLTHIO)-1,3,5-TRIAZIN-2-AMINE

4-(N,N-DIBUTYLAMINO)-BUTYRONITRILE

4-DICHLOROMETHYL-4-METHYL-2,5-CYCLOHEXADIENONE

4-DIMETHYLAMINO-O-TOLUALDEHYDE

4-(DIMETHYLAMINO)PHENYL ISOTHIOCYANATE

4-ETHYL-4-HYDROXY-3,4,12,14-TETRAHYDRO-1H-PYRANO[3'4':6,7]INDOLIZINO[1,2-B]QUINOLINE-3,14-DIONE