(6R,7R)-3-(Acetoxymethyl)-8-oxo-7-[(phenylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid | (6R,7R)-3-(acetoxymethyl)-8-keto-7-[(2-phenylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid |
(6R,7R)-3-(acetyloxymethyl)-8-oxo-7-[(2-phenylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid | (6R,7R)-3-(acetyloxymethyl)-8-oxo-7-(2-phenylethanoylamino)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid |