Cephemverbindungen und Verfahren zu ihrer Herstellung

A compound of the formula : wherein R is amino or protected amino, R is lower alkyl or lower alkenyl, R is lower alkyl, hydroxy(lower)alkyl or protected hydroxy(lower)alkyl, R is amino, protected amino, lower alkylamino, protected lower alkylamino, carboxy(lower)alkylamino, N-[protected carboxy(lower)alkyl]amino and R is hydrogen or lower alkyl, and a pharmaceutically acceptable salt thereof, processes for their preparation and pharmaceutical compositions comprising them as an active ingredient in admixture with pharmaceutically acceptable carriers.