JZL184, IUPAC name 4-nitrophenyl 4-[bis(1,3-benzodioxol-5-yl)(hydroxy)methyl]piperidine-1-carboxylate, was a small-molecule chemical compound that was a specific inhibitor of monoacylglycerol lipase (MAGL), with near-complete inhibition at approximately 1.0 nM.