Synonyms: MilbemycinB, 5-O-demethyl-28-deoxy-6,28-epoxy-23-hydroxy-25-(1-methyl-1-propenyl)-,[6R,23S,25S(E)]-; Milbemycin B,5-O-demethyl-28-deoxy-6,28-epoxy-23-hydroxy-25-[(1E)-1-methyl-1-propenyl]-,(6R,23S,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 S 541C; LL-F 28249b; Nemadectin b