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US5196528A 4-cyclohexenyl azetidinones and epoxy derivatives thereof 失效
4-环己基亚氨基酯及其环氧衍生物

4-cyclohexenyl azetidinones and epoxy derivatives thereof
摘要:
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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