2-({[(1Z)-1-(2-{[(4E,8S)-8-[(1S)-1-aminoethyl]-5-(2-amino-1,3-thiazol-4-yl)-2-carboxy-2-methyl-6,9-dioxo-4,7-diaza-3-oxanon-4-en-9-yl]amino}-1,3-thiazol-4-yl)-2-{[(3S,4S)-4-methyl-2-oxo-1-sulfoazetidin-3-yl]amino}-2-oxoethylidene]amino}oxy)-2-methylpropanoic acid