Aztreonam Impurity E Catalogue A242505 CAS 99341-02-3 M.W 435.43 M.F C13H17N5O8S2 Specifications FAQs 2-((((E)-1-(2-Aminothiazol-4-yl)-2-(((2S,3S)-2-methyl-4-oxo-1-sulfoazetidin-3-yl)amino)-2-oxoethylidene)amino)oxy)-2-methylpropanoic acid
