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cif-access (organic compounds)
The title compound is a polymorph (Z = 2, space group P1) of the orthorhombic form reported by Toda, Tanaka, Miyamoto, Koshima, Miyahara & Hirotsu [J. Chem. Soc. Perkin
Trans. 2 (1997), pp. 1877-1885]. There is an intramolecular
O-HO hydrogen bond in each molecule, with the
second hydroxy group free and not participating in hydrogen bonding.