deacetoxycephalosporin C (6R)-3-Methyl-7α-[[(R)-5-amino-5-carboxy-1-oxopentyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]octa-2-ene-2-carboxylic acid (6R,7R)-7-[[(R)-5-Amino-5-carboxy-1-oxopentyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Antibiotic WS-3442A WS-3442A Cefmenoxime Impurity 43 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-[[(5R)-5-amino-5-carboxy-1-oxopentyl]amino]-3-methyl-8-oxo-, (6R,7R)- 7-ADCA Impurity 6