EP3661933B1 - Process for Preparing 1-(((z)-(1-(2-Aminothiazol-4-Yl)-2-Oxo-2-(((3s,4r)-2-Oxo-4-((2-Oxooxazolidin-3-Yl)methyl)-1-Sulfoazetidin-3- Yl)amino)ethylidene)amino)oxy)cyclopropane Carboxylic Acid