Milbemycin B,5-O-demethyl-28-deoxy-6,28-epoxy-25-(1-methyl-1-propenyl)-, [6R,25S(E)]-;Spiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2'-[2H]pyran],milbemycin B deriv.; Antibiotic VM 44857; VM 44857
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