| abstract |
2-Heterocyclylniederalkyl-2-penem compounds of the formula I, wherein R 1 is hydrogen or methyl, R 2 deep an optionally protected hydroxyl group, R 3 deep carboxyl or protected carboxylic R 3 is deep, R deep 4 an over a ring carbon atom is represented on the radical - (CH deep 2) deeply m-bonded unsaturated monocyclic heterocyclyl radical and m is an integer of 1 to 4, salts of those compounds of formula I which have a salt-forming group, optical isomers of Compounds of the formula I and mixtures of these optical isomers have antibiotic properties. The compounds are prepared by methods known per se. |