Rifaximin EP Impurity B

Chemical Name: 4-O-(Carboxymethyl)rifamycin

Smile: [H][C@@](OC(C)=O)([C@@H]([C@H](/C=C/O[C@]1(OC2=C(C(O)=C3C4=C2C1=O)C)C)OC)C)[C@H](C)[C@@H]([C@@H]([C@H]([C@H](/C=C/C=C(C(NC(C=C4OCC(O)=O)=C3O)=O)/C)C)O)C)O