ChemInform Abstract: SYNTHESIS OF A 7-OXO-1,4-DIAZABICYCLO(3.2.0)HEPT-3-ENE-2-CARBOXYLATE (Δ1-AZAPENEM) AND A RELATED 3,7-DIOXO-1,4-DIAZABICYCLO(3.2.0)HEPTANE-2-CARBOXYLATE, A FUSED β,Γ-LACTAM

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