Cefonicid
Cefonicide (or cefonicid) is a cephalosporin antibiotic. It has a density of 1.92g/cm3. Synthesis
Injectable semi-synthetic cephalosporin antibiotic related to cefamandole, q.v. Cefonicid is synthesized conveniently by nucleophilic displacement of the 3-acetoxy moiety of 1 with the appropriately substituted tetrazole thiole 2. The mandelic acid amide C-7 side chain is reminiscent of cefamandole. See also 
 Cefazaflur

References 

Acetaldehyde dehydrogenase inhibitors
Cephalosporin antibiotics
Enantiopure drugs
Phenylethanolamines
Sulfonic acids
Tetrazoles