Cephalosporin compounds
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United States of America Patent
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Jul 25, 2000
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app pub date -
Sep 30, 1998
filing date -
Apr 25, 1994
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Expired
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Abstract
Cephalosporin derivatives of formula II ##STR1## wherein R.sup.a denotes hydrogen or a silyl group; R.sup.b denotes a group of formula --OR.sup.e, wherein R.sup.e denotes hydrogen or alkyl; and R.sup.c and R.sup.d together denote a bond; in free form or in salt form.
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