Cefoxitin EP Impurity B

Chemical Name: (2RS,6R,7S)-3-[(Carbamoyloxy)methyl]-7-methoxy-8-oxo-7-[[(thiophen-2-yl) acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid (as per EP)

Smile: [H][C@]1(C(O)=O)C(COC(N)=O)=CS[C@@]2([H])N1C([C@@]2(OC)NC(CC3=CC=CS3)=O)=O