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Many chalcogen-substituted derivatives of tetrathiafulvalene (TTF) are able to form metallic or even superconducting cation radical salts. The particular properties of bis(ethylenedithio)TTF (ET) prompted the synthesis of new oxygen-containing analogues of ET. One such new molecule, ETOX, is presented, which, besides being a new π-donor, is the first mono-oxa derivative of ET. It is shown to be a promising donor for molecular metals and superconductors that gives cation radical salts with a variety of stoichiometries.