Spiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2'-[2H]pyran],milbemycin B deriv.;13-[2-[4-(N-Methanesulfonyl-N-methylamino)phenyl]ethoxy]milbemycin A3
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