Rifaximin EP Impurity D

Chemical Name: (2S,16Z,18E,20R,22R,23R,24R,25S,26R,27S,28E)-5,6,20,23-Tetrahydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-1,15,21-ioxo-2,7-(epoxypentadeca[1,11,13]trienimino) furo[2”,3”:7’,8’]naphtho[1’,2’:4,5]imidazo[1,2-a]pyridin-25-yl acetate

Synonym: Rifaximin Y