Fluvalinate

Fluvalinate is a synthetic pyrethroid chemical compound contained as an active agent in the products Apistan, Klartan, and Minadox, that is an acaricide (specifically, a miticide), commonly used to control "Varroa" mites in honey bee colonies, infestations that constitute a significant disease of such insects.
Fluvalinate is a stable, nonvolatile, viscous, heavy oil (technical) soluble in organic solvents. 
Although the compound may be found in drones, a study has found honey samples virtually absent of fluvalinate, on account of its affinity to beeswax.
Stereoisomerism.
Fluvalinate is synthesized from racemic valine [(RS)-valine], the synthesis is not diastereoselective. Thus, fluvalinate is a mixture of four stereoisomers, each about 25%.
"Tau"-fluvalinate (τ-fluvalinate) is the trivial name for (2"R")-fluvalinate. The C atom in the valinate structure is in ("R")-absolute configuration, while the second chiral atom is a mixture of ("R")- and ("S")-configurations: