.beta.-Lactam antibiotics their preparation and their use

.beta.-Lactam antibiotics, a process for their preparation and t

.beta.-Lactam antibiotics, their preparation and their use in ph

.beta.-Lactam derivatives and process for production thereof

.beta.-Lactam precursors of penicillin and cephalosporin antibio

.beta.-Lactamase inhibitors

.beta.-Lactams

.beta.-Lactams, their production, intermediates thereto and deri

.beta.-Lactone esters

.beta.-Lactones of 2-hydroxy-cyclopentane-carboxylic acids

.beta.-Modified azo dye

.beta.-Phenoxy or substituted phenoxy ethanol compounds

.beta.-Phenyl-.beta.-azolyl-nitroethanes

.beta.-Substituted polyfluoroethyl compounds

.beta.-Substituted polyfluoropropionate salts and derivatives

.beta.-Sulfenyl acrylic acid compounds and process of preparing

.delta.-lactone derivatives and process of preparing same

.delta.-Substituted negamycin derivatives and syntheses

.DELTA..sup.1 -1-Azacycloalkene-2-carboxylic acids and their pro

.DELTA..sup.2,3 -0-2-Isocephem-4-carboxylic acid and derivatives