Cephem compounds, processes for their preparation, pharmaceutical compositions containing them and their starting compounds.

摘要

A compound of the formula:
<CHEM>
wherein
R1 is amino or a protected amino group,
R2 is aliphatic hydrocarbon group which may have suitable substituent(s), and
X is halogen;
and pharmaceutically acceptable salts thereof, and processes for their preparation and also a pharmaceutical composition comprising, as an active ingredient, the above compound in association with a pharmaceutically acceptable carrier or excipient. The invention also relates to the starting compounds
<CHEM>
and their preparation.