Chemical Name：2-Mercaptobenzolyl-α- (2-Aminothiazol-4-yl)-α -[(t-Butoxycarbonyl) -Isopropoxyimino] Acetate
【Molecular formula】：C₂₀H₂₂N₄O₄S₃ 
Structure：

Application：
Key intermediate for Ceftazidime, Aztreonam