1,4-Bis(4-methylpiperazinomethyl)-2,3,5,6-tetrachlorobenzene tetrahydrochloride dihydrate 55405-36-2 Piperazine, 1,1'-((2,3,5,6-tetrachloro-1,4-phenylene)bis(methylene))bis(4-methyl-, hydrochloride, hydrate (1:4:2)