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5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid,7-[[[4-(2-amino-1-carboxy-2-oxoethylidene)-1,3-dithietan-2-yl]carbonyl]amino]-7-methoxy-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-,sodium salt (1:2), (6R,7S)-