high purity,low metal impurity for pharma use LufenuronIUPAC:1-[2,5-Dichloro-4-(1,1, ... and Ferrous 20 ppm max Unknown single impurity≤ 0.5% Assay(HPLC)No less than 99.0% Application: in the control medication ... , and anthelmitic medicine. lufenuron, 99% top pharma quality flea control for veterinary,anthelmintic medicine