Aztreonam Impurity B Catalogue A242502 CAS 102586-36-7 (free acid) M.W 372.38 22.99 M.F C13H18N5O6S. Na Specifications FAQs Synonyms: (2S,3S)-3-amino-2-((Z)-2-(2-aminothiazol-4-yl)-2-(((2-carboxypropan-2-yl)oxy)imino)acetamido)butanoic aci