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(1999)(E)-3-{(2R,3S)-1-[(S)-2-Methanesulfonyloxy-1-((4S,5R,4'R)-2,2,2',2'-tetramethyl-[4,4']bi[[1,3]dioxolanyl]-5-yl)-ethyl]-3-methoxy-4-oxo-azetidin-2-yl}-acrylic acid benzyl ester
4β-((E)-2-Benzyloxycarbonyl-1-ethene)-1-[(1',2'-dideoxy-3',4':5',6'-di-O-isopropylidene)-1',1'-((E)-2-ethoxycarbonyl-1-ethenyl)-D-2'-glucosyl]-3β-methoxyazetidin-2-one