Two new C-glucofuranosyl isoflavones in puerarin injection

Two new C-glucofuranosyl isoflavones of impurities in puerarin injection were isolated. Their structures were determined to be 8-C-α-glucofuranosyl-7, 4′-dihydroxyisoflavone and 8-C-β-glucofuranosyl-7, 4′-dihydroxy- isoflavone by chemical and spectral analysis.