Rifaximin-d6
CAS No. 1262992-43-7
C43H45D6N3O11
M.W. 791.93

Rifaximin EP Impurity G
CAS No. 80621-76-7
C43H49N3O11
M.W. 783.88

Rifaximin EP Impurity B (Rifamycin B)
CAS No. 13929-35-6
C39H49NO14
M.W. 755.82

Rifaximin EP Impurity C (Rifamycin SV)
CAS No. 6998-60-3
C37H47NO12
M.W. 697.79

Rifaximin EP Impurity F (Rifamycin O)
CAS No. 14487-05-9
C39H47NO14
M.W. 753.80

Rifaximin EP Impurity E (Rifamycin S)
CAS No. 13553-79-2
C37H45NO12
M.W. 695.76

Rifaximin EP Impurity A
CAS No. 695-34-1
C6H8N2
M.W. 108.14
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