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Cephem-derived products bound to L1.A, views from the active sites of cefoxitin- (salmon) and cefmetazole-derived (pink) products in L1. B, simplified possible pathway to the formation of the crystallographically observed products involving protonation of C-3 (resulting in 3R stereochemistry) from the same face of the dihydrothiazine ring as in carbapenems.
