title: 6,11-Dihydroxy-naphthacene-5,12-dione.
abstract: The mol-ecule of the title compound, C(18)H(10)O(4), is centrosymmetric and planar. A long phenolic O-H bond is observed [1.19 (9) Å], which is involved in an intra-molecular hydrogen bond between the phenolic and quinonoid O atoms. The mol-ecules pack in a herringbone pattern and are linked to each other via inter-molecular C-H⋯O hydrogen bonds (2.73-2.77 Å).
authors.forename: Masaaki
authors.initials: M
authors.lastname: Tomura
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ono
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Saito