4,1-benzoxazepin derivatives and their use

4-(2,3 epoxypropane)azetidinones

4-(phenylthio or phenylsulfonyl) azetidinones and process of man

4-amino derivatives of 2-oxo-1-azetidinesulfonic acid salts

4-amino-2-(hetero)aryl-butanamides useful as 5-HT.sub.1A -antago

4-aminotetrahydrobenzisoxazole or -isothiazole compounds

4-aryl-4-piperidine (or pyrrolidine or hexahydroazepine) carbino

4-azatricyclo[4.3.1.1(3,8)]undecylarylpiperazines with anxiolyti

4-benzyl-1-(2H)-phthalazinone-derivates

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

4-Cyano-2-azetidinones and production thereof

4-substituted alkyl carbapenem antibiotics

4-thio azetidinone intermediates and process for the preparation