4-cyclohexenyl azetidinones and epoxy derivatives thereof
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United States of America Patent
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Mar 23, 1993
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N/A
app pub date -
Jul 12, 1991
filing date -
Jul 13, 1990
priority date (Note) -
Expired
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Abstract
Compounds of formula ##STR1## in which R.sub.1 is hydrogen or a hydroxyl protecting group and --X--Y--is --CH.dbd.CH-- or ##STR2## useful as intermediates in the preparation of antibacterially active compounds.
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