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Synthesis and in vitro activity of a number of cephalosporins having alpha-sulfoacyl- or other acyl groups, e.g., alpha-carboxyacyl- and alpha-sulfoaminoacyl- at the 7-position and bearing a variety of heterocyclic thioether or pyridinium moieties at the 3-position are described.

Semisynthetic .BETA.-lactam antibiotics. 8. Structure-activity relationships of .ALPHA.-sulfocephalosporins.