<chemical> A cephalosporin antibiotic. ... Pharmacological action: cephalosporins. ... Chemical name: Pyridinium, 1-((2-carboxy-8-oxo-7-((2-thienylacetyl)amino)-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)methyl)-, inner salt, (6R-trans)- ... (12 Dec 1998) ... Found on http://www.encyclo.co.uk/local/20973