Crystal structure of PBP3 in complex with BAL30072 ((2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-{[(1,5-dihydroxy-4-oxo-1,4-dihydropyridin-2-yl)methoxy]imino}-N-{(2S)-1-hydroxy-3-methyl-3-[(sulfooxy)amino]butan-2-yl}ethanamide)