Synonyms: MilbemycinB, 28-deoxy-6,28-epoxy-22-hydroxy-25-(1-methyl-1-propenyl)-, [6R,22R,25S(E)]-;Milbemycin B, 28-deoxy-6,28-epoxy-22-hydroxy-25-[(1E)-1-methyl-1-propenyl]-,(6R,22R,25S)- (9CI);Spiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2'-[2H]pyran],milbemycin B deriv.; Antibiotic VM 44864; VM 44864