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The reaction of activated derivatives of clavulanic acid with substituted amidoethenyl thiolates to give 9-(2-amidoethenylthio)-9-deoxy derivatives is described; the antibacterial/synergistic and beta-lactamase inhibitory activities of the thioethers and their corresponding sulfoxides and sulfones are compared.

Synthesis and .BETA.-lactamase inhibitory activity of 9-(2-amidoethenylthio)-9-deoxy derivatives of clavulanic acid.