Resolution: standard / high
Figure 1.
Chemical structure of ivermectin. Ivermectin contains not less than 93.0% of 22,23
dihydroavermectin B1a (R = CH3) and the sum of B1a and B1b (R = C2H5) is not less than 97.0%. B1a, and not less than 97.0% of 22,23-dihydroavermectin
B1 (B1a + B1b).
Edwards Filaria Journal 2003 2(Suppl 1):S8 doi:10.1186/1475-2883-2-S1-S8