4-Bromo-3-chloro-phenylisocyanate

4-Butyl-3,4,5-trimethylcyclohexa-25-dienone

4-Carbamoyl-1-benzazepines

4-Carbamoylamino-.alpha.-aminomethylbenzyl alcohol derivatives

4-Carbamoyloxymethyl-1-sulfo-2-oxoazetidine derivatives and thei

4-Carboxy azetidinone compounds and production thereof from dike

4-Chloroazetidinone

4-Chloroazetidinone-1-(2',3'-dichloroisopropyl) acetates and pro

4-Cyano-2,6-dinitroanilines

4-Cyano-2-azetidinones and production thereof

4-Cyclopropylmethyleneoxy-3-chlorophenylacetic acid and salts th

4-Dedimethylamino-4-arylsulfonamido-5a,6-anhydrotetracyclines

4-Desacetoxy-3-hydroxyvinblastine

4-Desacetoxy-4-oxovinblastine

4-Desacetoxy-4.alpha.-hydroxyvinblastine and related compounds

4-Desacetoxyvinblastine

4-Dimethylaminopyridinium chlorochromate as an oxidizing agent f

4-Dithio-3-imido-azetidin-2-ones

4-Ethers of 3-amino-5-sulfamoylbenzoic acids

4-Exo-hydroxy-endo-tricyclo [5.2.2.0.sup.2,6 ]undec-8-ene