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The synthesis and in vitro antibacterial activity of 7 beta-[(Z)-2-(2-amino-4-thiazolyl)-2-carboxymethoxyiminoacetamido]- 3-(2,2-dihalovinyl)cephalosporins are described. 3-(2,2-Dihalovinyl)cephalosporins exhibited excellent antimicrobial activity against both Gram-positive and Gram-negative bacteria, especially showed higher activity against Staphylococcus aureus than the corresponding 3-vinylcephalosporin.

Studies on .BETA.-lactam antibiotics. XI. Synthesis and structure-activity relationships of new 3-(2,2-dihalovinyl)cephalosporins.