Synonyms: MilbemycinB, 28-deoxy-25-(1,3-dimethyl-1-butenyl)-6,28-epoxy-23-hydroxy-,[6R,23S,25S(E)]-; Milbemycin B,28-deoxy-25-[(1E)-1,3-dimethyl-1-butenyl]-6,28-epoxy-23-hydroxy-, (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 541F; L 759154; LL-F 28249l