(6R,13S,25R)-5-O-Demethyl-28-deoxy-6,28-epoxy-13-hydroxy-25-[(1S)-1- methylpropyl]milbemycin B (or H2B1a aglycone – EP Impurity G)
(6R,13S,25R)-5-O-Demethyl-28-deoxy-6,28-epoxy-13-hydroxy-25-[(1S)-1- methylpropyl]milbemycin B (or H2B1a aglycone – EP Impurity G)