deacetoxycephalosporin

Noun

 * 1)  The heterocyclic carboxylic acid  (6R,7R)-7-[[(5R)-5-amino-5-carboxypentanoyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid  and related compounds.