发明授权
US4473566A 7-(.alpha., .alpha.-Disubstituted-acetamido)-3-substituted-3-cephem-4-carboxylic acids 失效
7-(α,α-二取代 - 乙酰氨基)-3-取代-3-头孢烯-4-羧酸

7-(.alpha.,
.alpha.-Disubstituted-acetamido)-3-substituted-3-cephem-4-carboxylic
acids
摘要:
7-(.alpha.,.alpha.-disubstituted-acetamido)-3-substituted-3-cephem-4-carboxylic acids having antibacterial properties and the following formula are disclosed: ##STR1## wherein R.sup.1 is hydrogen, halogen, hydroxy, nitro, lower alkoxy or acylamino, R.sup.2 is hydrogen or acyl andR.sup.3 is lower alkanoyloxy, carbamoyloxy which may have lower alkyl, aryl or protective group for amino or a heterocyclicthio which may have lower alkyl.
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