1,4-Di-tert-butyl (2R,3R)-2-({(2E)-3-[4(acetyloxy)phenyl]prop-2-enoyl}oxy)-3hydroxybutanedioate

The title compound, C₂₃H3₃₀O₉, has an approximate T-shape with the tert-butyl ester groups lying either side of the benzene ring. The acetyl group is almost perpendicular to the benzene ring to which it is connected [C-C-O-C torsion angle = -106.7 (3)°]. The conformation about the C=C double bond [1.331 (4) Å] is E. Linear supramolecular chains along the a axis mediated by hydroxy-carbonyl O-H...O hydrogen bonds feature in the crystal packing. The same H atom is also involved in an intramolecular O-H...O interaction.Josh L. Hixson, Dennis K. Taylor, Seik Weng Ng and Edward R. T. Tiekin