Dalspinin, an isoflavone from Dalbergia spinosa roots

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The X-ray crystal structure of the plant isoflavone dalspinin from Dalbergia spinosa is determined. The compound, C17H12O7, is monoclinic in P21/n with a = 3.970(1), b = 23.607(5), c = 14.633(3) Å, β = 94.46(3)°, V = 1367.2(5) Å3, Dcalc = 1.595 g cm−1 and Z = 4. The molecular structure is characterized by a short intramolecular O–H···O=C hydrogen bond, and a large tilt angle of the two rigid ring systems with respect to each other. The intermolecular interactions in the crystal are discussed.

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