发明授权
US4081443A Penicillin oxides 失效
青霉素氧化物

Penicillin oxides
摘要:
Compounds of the formula: ##STR1## (where COB is carboxy or protected carboxy and X is hydrogen or nucleophilic group)preparable by oxidation of the corresponding N-nitrosopenicillin derivatives are useful as starting materials for synthesizing known and useful cephalosporins.
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