6β-((R)-2-{3-[2-(ethyl-hydroxyoxalyl-amino)-ethyl]-ureido}-2-phenyl-acetylamino)-penicillanic acid;Piperacillin Impurity 18;Piperacillin Oxalylamide ~85%;4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[[[[[[2-[(carboxycarbonyl)ethylamino]ethyl]amino]carbonyl]amino]phenylacetyl]amino]-3,3-dimethyl-7-oxo-, [2S-[2α,5α,6β(S*)]]- (9CI);Piperacillin Oxamide(Piperacillin Impurity 12);Piperacillin Oxamide(Piperacillin EP Impurity M);Piperacillin oxalylamideQ: What is Piperacillin oxalylamide Q: What is the CAS Number of Piperacillin oxalylamide;Piperacillin EP Impurity M