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The crystalline form of trans- δ -[ p -methoxystyryl]-4-methoxy- α -pyron is assigned to space group  P 2 1 / c – C  2 h   5  having parameters  a  = 7.313,  b  = 7.480,  c  = 23.721 Å and  β  = 94°21′. The crystal structure was found from the Patterson diagramm using the special symmetry of the space group  P 2 1 / c . The refinement by the block-diagonal-matrix least squares led to a  R  value of 0.07 using 2256 reflections. The molecules are approximately planar and are held together by van der Waals forces only.

Die Molekular- und Kristallstruktur von trans-δ-[ p -Methoxystyryl]-4-methoxy-α-pyron (Yangonin) C 15 H 14 O 4 *