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2,2,2-Trinitroethanol, C2H3N3O7, at 100 (2) K has Z′ = 2 in the space group P21/c. The structure displays intramolecular O—H...O hydrogen bonds, as well as intermolecular O—H...O and C—H...O hydrogen bonding; the O—H...O hydrogen bonds, forming R44(8) rings, and dipolar nitro–nitro interactions account for the high density of 1.839 Mg m−3.