Keywords: 22,23-dihydroavermectin B1b.svg Skeletal formula of 22 23-dihydroavermectin B<sub>1b</sub> one of the constituents of ivermectin Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape Own 2007-10-10 Fvasconcellos 22 29 10 October 2007 UTC Antiparasitic agents Avermectins |