(6R,7R)-3-(hydroxymethyl)-8-oxo-7-(2-(thiophen-2-yl)acetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid; Deacetylcephalothin; (6R,7R)-3-(Hydroxymethyl)-8-oxo-7-[(2-thienylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid; (6R-trans)-3-(Hydroxymethyl)-8-oxo-7-[(2-thienylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid; 3-(Hydroxymethyl)-8-oxo-7-[2-(2-thienyl)acetamido]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid; (6R,7R)-3-(Hydroxymethyl)-8-oxo-7-[[2-(2-thienyl)acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid; (6R,7R)-3-Hydroxymethyl-7-(thien-2-ylacetamido)ceph-3-em-4-carboxylic Acid; 3-Hydroxymethyl-7-(2-thienylacetamide)-3-cephem-4-carboxylic Acid; Deacetylcephalotin; Desacetylcephalothin; Cefalotin EP Impurity B