... 1-methylethyl)avermectin A1a (ii)CAS NO.71751-41-2EINECS NO.265-610-3Molecular FormulaC48H72O14·C47H70O14Molecular Weight1732. ... -18-47(62-43)23-34-20-33(61-47)16-15-27(4)42(26(3)13 ... -17-46(61-41)22-33-19-32(60-46)15-14-26(4)42(25(3)12 ... +,33-,34+,35+,36+,37+,38+,39+,40-,41+,42+,43-,44+,45-,47-,48-;25-,27-,29-,30 ... +,33-,34-,35-,36-,37-,38-,39+,40-,41+,42-,43-,44+,46+,47+/m10/s1 Density1.16Melting point150- ...