3-(CHFCH.sub.3)-azetidinone intermediates
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United States of America Patent
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Oct 18, 1988
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N/A
app pub date -
Feb 18, 1987
filing date -
Feb 19, 1986
priority date (Note) -
Expired
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Abstract
An azetidinone derivative of the formula ##STR1## wherein R.sub.1 represents a formyl group, a carboxyl group, an acetyloxy group or a group of the formula ##STR2## in which R.sub.2 and R.sub.3 each represent a lower alkyl group or together represent a lower alkylene group, and Z represents a hydrogen atom or an amino-protecting group.
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