7-acylamino-3-vinylcephalosporanic acid derivatives of the formula: CHEM in which R1 is amino-substituted-heterocyclic group which may have halogen, protected amino-substituted-heterocyclic groug which may have halogen, or a group of the formula: CHEM wherein R3 is lower alkyl, R2 is carboxy or a protected carboxy group, A is lower alkylene which may have certain substituents and pharmaceutically acceptable salt thereof and processes for their preparation and also a pharmaceutically composition comprising, as an effective ingredient, the above compound in association with pharmaceutically acceptable carriers. The invention also relates to the starting compounds CHEM and other starting compounds and their preparation. h
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机译：式：的7-酰基氨基-3-乙烯基头孢烷酸衍生物，其中R 1为可具有卤素的氨基取代的杂环基，可具有卤素的保护的氨基取代的杂环基，或式：其中R 3是低级烷基，R 2是羧基或被保护的羧基，A是可以具有某些取代基的低级亚烷基及其药学上可接受的盐及其制备方法以及药学上组合物，其包含上述化合物作为有效成分以及药学上可接受的载体。本发明还涉及起始化合物和其他起始化合物及其制备。 H
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