Avermectin A1a, 5-O-demethyl-4''-deoxy-4''-(methylamino)-, (4''R)-;Spiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2'-[2H]pyran], avermectin A1a deriv.;4''-Deoxy-4''-epi-(methylamino)avermectin B1a;L 656748;
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