1,1'-(4,6-Dimethyl-m-phenylenebis(iminocarbonylmethylene))bis(1-methylpiperidinium iodide) 107420-32-6 Piperidinium, 1,1'-(4,6-dimethyl-m-phenylenebis(iminocarbonylmethylene))bis(1-methyl-, diiodide