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201310547(2S,5R,6R)-3,3-dimethyl-7-oxo-6-(2-(2-oxoimidazolidine-1-carboxamido)-2-phenylacetamido)-4-thia-1-aza

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201310550(6R,7R)-3-(acetyloxymethyl)-7-[(2-cyanoacetyl)amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carb

201310551(6R,7R)-3-(hydroxymethyl)-8-oxo-7-[(2-pyridin-4-ylsulfanylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct

201310552N-[(4R,5R)-3,11-dioxo-10-oxa-6-thia-2-azatricyclo[6.3.0.02,5]undec-1(8)-en-4-yl]-2-pyridin-4-ylsulfan

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