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organic compounds
The central ring of the anthrone system in 1,8-diiodo-10-hydroxy-10-(3-methylbut-3-en-1-ynyl)-anthracen-9(10H)-one, C19H12I2O2, has a boat conformation and the two outer rings form a dihedral angle of 41.1 (2)°. The I—C bond lengths are 2.094 (4) and 2.083 (4) Å. The hydroxyl and carbonyl groups form an intermolecular hydrogen bond having an OO distance of 2.853 (4) Å.