2-PROPEN-1-YL (3S,4R)-3-((1R)-1-(((1,1-DIMETHYLETHYL)DIMETHYLSILYL)OXY)ETHYL)-.ALPHA.,2-DIOXO-4-((((2R)-TETRAHYDRO-2-FURANYL)CARBONYL)THIO)-1-AZETIDINEACETATE
2-propen-1-yl (3s,4r)-3-((1r)-1-(((1,1-dimethylethyl)dimethylsilyl)oxy)ethyl)-.alpha.,2-dioxo-4-((((2r)-tetrahydro-2-furanyl)carbonyl)thio)-1-azetidineacetate