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以工业青霉素Ｇ钾盐为原料，经氧化、扩环重排、裂解三步反应制得７－氨基去乙酰氧基头孢烷酸，总收率６８．７％。
7-Aminodeacetoxycephalosporanic acid was obtained from the industrial potassium penicillin G as raw material through oxidation, ring expansion rearrangement and pyrolysis. The total yield was 68.7%.