title: 4,6-Dinitro-pyrogallol.
abstract: In the title mol-ecule, C(6)H(4)N(2)O(7), the two nitro groups are tilted with respect to the aromatic ring by 11.2 (1) and 10.9 (1)°. All three hy-droxy groups are involved in the formation of bifurcated intra- and inter-molecular O-H⋯O hydrogen bonds. The crystal packing exhibits short O⋯O distances of 2.823 (2) Å between two O atoms of the nitro groups.
authors.affiliation: Fachrichtung Chemie, Universität des Saarlandes, Postfach 151150, D-66041 Saarbrücken,  Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Neis
authors.forename: Günter J
authors.initials: GJ
authors.lastname: Merten
authors.forename: Kaspar
authors.initials: K
authors.lastname: Hegetschweiler