Lasalocid
Lasalocid is an antibacterial agent and a coccidiostat, which is produced by strains of Streptomyces lasaliensis. It is the drug in the feed additives called Bovatec and Avatec.
Lasalocid is able to make neutral complexes with monovalent and divalent cations and transport them through apolar phase (including lipid bilayer membranes). It can transport also big organic cations like dopamine.