Abstract. C14H120 4, monoclinic, P21, a = 7.511 (1), b= 7.297 (3), c = 11.084 (1)A, #= 104.78 (2)°, Z = 2, D x = 1.381 Mg m -3, T = 295 K, Mo Ka (2 = 0.7107 A). The structure was solved by direct methods and refined by full-matrix least-squares techniques to a conventional R of 0.034 for 1025 reflections with intensities above 2a. The structure consists of discrete molecules with only van der Waals forces between them. The structure is nearly identical to the parent cantharidin molecule with some distortions due to the added fused aromatic ring. In particular the internal angles in the saturated six-membered rings, at the fusion with the aromatic ring, increase because of the shortening of the common C-C bond. Whereas the parent compound has crystallographic mirror symmetry, the present compound has only approximate mirror symmetry because of the crystallographic environment. Bond distances and angles are normal.
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