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DODHT [(1,4-dioxan-2,3-diyldithio)dihydrotetrathiafulvalene] contains only one 1,3-dithiol-2-ylidene unit as a π-electron system, which leads to the larger on-site Coulomb energy compared to the conventional TTF-type donors. The crystal structures of (DODHT)₂X (X = AsF₆ and PF₆) are isostructural and both the salts showed superconducting transition at around 3 K under pressure.