amino deacetoxy cephalosporanic acid (7-ADCA) is a intermediate for cephalosporin, it is prepared from penicillin, via oxidation reaction, ring enlargement and rearrangement reaction and enzymolysis.

• 氨基去乙酰氧基头孢烷酸(7-ADCA)是头孢菌素合成的重要中间体,一般以青霉素为原料,经氧化,扩环-重排,裂解三步反应制备。