Crystal Structure of the Curcumin Derivative, Acetic Acid 4-[7-(4-Acetoxy-3-methoxyphenyl)-3,5-dioxoheptyl]-2-methoxyphenyl ester

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C₂₅H₂₈O₈ is monoclinic, P2₁. The unit-cell dimensions at 293 K are a = 8.054(1), b = 9.438(2), c = 15.701(1)Å, β = 98.875 (2)°, V = 1179.1(2)ų, D_x = 1.286 g/cm³, and Z = 2. The R value is R = 0.046 for 4152 reflections. There is an intramolecular hydrogen bond with an O2…O1 distance of 2.496(1)Å. The molecules in the crystal are packed at the normal van der Waals distances.