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The title compound (C6N3H18)2Ti4O4(C204)7.4H2O 1 (C13H22N3O18Ti2, Mr=604.14) was synthesized by the reaction of Ti(SO4)2, H2C2O4.2H2O and N-(2-ammonioethyl)-piperazinium (AEPP) in aqueous solution. The single-crystal X-ray analysis has revealed that 1 cry