The 2-transitive permutation representa-tions of the finite Chevalley groups

Disclosed herein are novel analogs of cephalosporins. They differ from prior art compounds in that they are substituted in the 2-position and can be prepared by reacting known cephalosporins with an active source of halogen to form a 2-halogenated intermediate. Substitution of the thus formed intermediate can be accomplished with various substituents. The compounds of this invention are useful antimicrobial and antibacterial agents.

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