Δ2-4(R)-avermectin B1a

4'',5,7-tris-O-trimethylsilyl-avermectin B1

(1S,2S,3S,5S,6S)-3-((tert-butyldiphenylsilyloxy)methyl)-5-methyl-2-(1-methylene-3-(phenylthio)propyl)-7-oxabicyclo(4.1.0)heptan-2-ol

(1S,4S,6S)-6-[(tert-butyldiphenylsilyloxy)methyl]-4-methyl-1-[1-methylene-3-(phenylsulphonyl)propyl]cyclohex-2-enol