(E)-1-(4-(4-(2-Methylbut-2-en-1-yl)piperazin-1-yl)phenyl)ethanone is an intermediate in the synthesis of (E)-1-(4-(4-(2-Methylbut-2-en-1-yl)piperazin-1-yl)phenyl)ethanone Hydrochloride (M725995), which is a piperazinyl phenylethanone compound that acts as an inhibitor of traffic between the trans-Golgi network (TGN) and endosomes that depends on the clathrin adaptor complex AP-1. Additionally, Membrane Traffic Inhibitor, A5 has been shown to have little effect against other trafficking pathways involving endosomes and TGN.