Purity ~95% (HPLC). Eprinomectin is a semi-synthetic avermectin analogue introduced as a topical endectocide (insecticide, miticide and nematocide) for cattle, including lactating dairy cows. Like all avermectins and milbemycins, eprinomectin acts by binding to parasite glutamate- gated chloride ion channels and disrupts neurotransmission leading to paralysis and death of the parasite, mite or insect. Source: Eprinomectin from Semi-synthetic. Molecular Weight: ~900.1 Solubility: Soluble in ethanol, methanol, DMF or DMSO. Limited water solubility.