Synthesis and bioactivity of 5-Ivermectin B-1a esters
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Ten 5-Ivermectin B-1a ester derivatives were prepared from Ivermectin B-1a and carboxylic acids in the systems of DCC/DMAP. Their chemical structures were determined by IR, H-1 NMR, C-13 NMR. and MS spectra. The preliminary results of bioassay showed that L-1 similar to L-10 have good insecticidal activities.