4-Thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,7-oxo-6-[(5,6,7,8-tetrahydro-7-methyl-6-oxoimidazo[1,2-a]pyrazin-2-yl)methylene]-, sodium salt, (5R,6E)-
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