Pivampicillin Impurity B

(2S,5R,6R)-6-((2S,5R,6R)-6-((R)-2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid

(2S,5R,6R)-6-(2-((R)-2-amino-2-phenylacetamido)-2-((4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid

(4S,4'S)-2,2'-((1R,7R,13R)-1-amino-14-(((2S,5R,6R)-2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-6-yl)amino)-2,5,8,11,14-pentaoxo-1,7,13-triphenyl-3,6,9,12-tetraazatetradecane-4,10-diyl)bis(5,5-dimethylthiazolidine-4-carboxylic acid)

(S)-6-((R)-2-amino-2-phenylacetamido)-2,2-dimethyl-7-oxo-2,3,4,7-tetrahydro-1,4-thiazepine-3-carboxylic acid

2-((R)-2-amino-2-phenylacetamido)-2-((4S)-5,5-dimethyl-4-(((pivaloyloxy)methoxy)carbonyl)thiazolidin-2-yl)acetic acid

3-(hydroxymethylene)-6-phenylpiperazine-2,5-dione

(2S,5R,6R)-3-oxo-1,3-dihydroisobenzofuran-1-yl 6-((R)-2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate hydrochloride

(2S,5R,6R)-3,3-dimethyl-7-oxo-6-pivalamido-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid

3-phenylpyrazin-2-ol

sodium (4S)-2-(((R)-2-amino-2-phenylacetamido)methyl)-5,5-dimethylthiazolidine-4-carboxylate

sodium (4S)-2-(((R)-2-amino-2-phenylacetamido)(carboxylato)methyl)-5,5-dimethylthiazolidine-4-carboxylate

(2S,5R,6R)-6-((S)-2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid