China (3s, 4r) -4-Acetoxy-3-[ (r) -1- (tert-butyldimethylsilyloxy) Ethyl]Azetidin-2-One / 4-AA, Find details about China Carbapenem, 4-AA from (3s, 4r) -4-Acetoxy-3-[ (r) -1- (tert-butyldimethylsilyloxy) Ethyl]Azetidin-2-One / 4-AA