4-THIA-1-AZABICYCLO(3.2.0)HEPT-2-ENE-2-CARBOXYLIC ACID, 6-(1-(((1,1-DIMETHYLETHYL)DIMETHYLSILYL)OXY)ETHYL)-7-OXO-3-((TETRAHYDRO-1-OXIDO-3-THIENYL)THIO)-, 2-PROPENYL ESTER, (5R-(3(1R*,3S*),5.ALPHA.,6.BETA.(R*)))-
4-thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 6-(1-(((1,1-dimethylethyl)dimethylsilyl)oxy)ethyl)-7-oxo-3-((tetrahydro-1-oxido-3-thienyl)thio)-, 2-propenyl ester, (5r-(3(1r*,3s*),5.alpha.,6.beta.(r*)))-