Aztreonam Impurity B

2-(((Z)-(1-(5-(((2R,3S)-2-((Z)-2-(2-aminothiazol-4-yl)-2-(((2-carboxypropan-2-yl)oxy)imino)acetamido)-3-(sulfoamino)butanoyl)oxy)thiophen-3-yl)-2-(((2S)-2-methyl-4-oxo-1-sulfoazetidin-3-yl)amino)-2-oxoethylidene)amino)oxy)-2-methylpropanoic acid

(8R,16S,Z)-16-amino-5-(2-aminothiazol-4-yl)-11-imino-2,2-dimethyl-6,9-dioxo-8-((S)-1-(sulfoamino)ethyl)-3-oxa-4,7,10,12-tetraazaheptadec-4-ene-1,17-dioic acid

(4Z,8S,9R,12R,15Z)-5,15-bis(2-aminothiazol-4-yl)-2,9,18-trimethyl-6,11,14-trioxo-12-(sulfocarbamoyl)-3,17-dioxa-4,7,10,13,16-pentaazanonadeca-4,15-diene-2,8,18-tricarboxylic acid

(2S,3S)-3-((Z)-2-(2-aminothiazol-4-yl)-2-(((1-ethoxy-2-methyl-1-oxopropan-2-yl)oxy)imino)acetamido)-2-methyl-4-oxoazetidine-1-sulfonic acid

2-(((Z)-(1-(2-aminothiazol-4-yl)-2-(((2S,3S)-2-methyl-4-oxoazetidin-3-yl)amino)-2-oxoethylidene)amino)oxy)-2-methylpropanoic acid