4-(1H-PYRROL-1-YL)BENZYLAMINE

4-(1-NAPHTHYLAMINO)-4-OXOBUT-2-ENOIC ACID

4-(2,3-DIHYDRO-1,4-BENZODIOXIN-6-YL)BUTANOIC ACID

4-(2,3-DIHYDROIMIDAZO[2,1-B][1,3]THIAZOL-6-YL)ANILINE

4-(2,4-DIFLUOROPHENOXY)-N'-HYDROXY-3-NITROBENZENECARBOXIMIDAMIDE

4-(2-Aminoethyl)benzenesulfonylfluoride hydrochloride

4-(2-CHLOROETHYL)ACETOPHENONE

4-(2-FURYLMETHYL)-1LAMBDA6,4-THIAZINANE-1,1-DIONE

4-(2-PHENYLETH-1-YNYL)BENZALDEHYDE OXIME

4-(2-THIAZOLYLAZO)RESORCINOL

4-(2-THIENYL)PYRIMIDINE-2-THIOL