1,1'-(1,4-Piperazinediylbis(carbonylethylidene))bis(1-methylpiperidinium) diiodide 1715-36-2 Piperidinium, 1,1'-(1,4-piperazinediylbis(2-oxo-1-methyl-2,1-ethanediyl))bis(1-methyl-, 2I Piperidinium, 1,1'-(1,4-piperazinediylbis(carbonylethylidene))bis(1-methyl-, diiodide