... methylethyl)avermectin A1a (ii)CAS NO.71751-41-2EINECS NO.265-610-3Molecular FormulaC48H72O14·C47H70O14Molecular Weight1732 ... )13-12-14-32-24-55-45-40(49)29(6)19-35(46(51) ... )56-38;1-24(2)41-27(5)16-17-46(61-41)22-33-19-32(60- ... 20-35(52-9)40(49)29(7)55-37/h12-15,17-19,25-26,28 ... +,33-,34+,35+,36+,37+,38+,39+,40-,41+,42+,43-,44+,45-,47-,48-;25-, ... +,33-,34-,35-,36-,37-,38-,39+,40-,41+,42-,43-,44+,46+,47+/m10/s1 ...