Elimination of a Good Leaving Group from the 3'-Position of a Cephalosporin Need Not Be Concerted with β-Lactam Ring Opening: TEM-2 β-Lactamase-Catalyzed Hydrolysis of Pyridine-2-azo-4'-(N',N'-dimethylaniline) Cephalosporin (PADAC) and of Cephaloridine

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