... 1-methylethyl)avermectin A1a (ii)CAS NO.71751-41-2EINECS NO.265-610-3Molecular FormulaC48H72O14·C47H70O14Molecular Weight1732. ... -10)44(31(8)57-39)60-38-21-36(53-9)41(50)30(7)56-38 ... 41)22-33-19-32(60-46)15-14-26(4)42(25(3)12-11-13-31-23-54-44-39 ... +,30+,31+,33-,34+,35+,36+,37+,38+,39+,40-,41+,42+,43-,44+,45-,47-,48-;25-,27-, ... -,30-,32+,33-,34-,35-,36-,37-,38-,39+,40-,41+,42-,43-,44+,46+,47+/m10/s1 Density1. ...