abstract |
Antibacterial 7β-(oxo-saturated heterocyclic carbonamido)-3-cephem-4-carboxylic acid derivatives of the formula: ##STR1## (wherein R is hydrogen or methoxy; R 1 is hydrogen or a nucleophilic group; R 2 is hydrogen, light metal, or a carboxy protecting group; X is oxygen, sulfur, sulfinyl, or sulfonyl; Y is alkylene containing one or more hetero atoms; and Z is hydrogen or a substituent). |