Chemical Name: Aztreonam USP Impurity E l Aztreonam E-Isomer ; (E)-2-({[(2-Amino-4-thiazolyl){[(2S,3S)-2-methyl-4-oxo-1-sulfo-3-azetidinyl]carbamoyl}methylene]amino}oxy)-2-methylpropionic acid
Smile: CC(C)(O/N=C(C1=CSC(N)=N1)/C(N[C@H]2[C@H](C)N(S(=O)(O)=O)C2=O)=O)C(O)=O