Syn isomers of cephalosporins having alpha -hydroximino- or alpha -acyloxyiminoacylamido groups at position-7

摘要

The invention provides novel antibiotic compounds which are 7 beta -acylamidoceph-3-em-4-carboxylic acids, and non-toxic derivatives thereof, and 6 beta -acylamidopenam-3-carboxylic acids, and non-toxic derivatives thereof, characterized in that the acylamido group has the structure <IMAGE>