Crystal structure of diethyl {2,2,2-tri-chloro-1-[2-(1,3-dioxo-2,3-di-hydro-1H-isoindol-2-yl)-4-methyl-pentanamido]-eth-yl}phospho-nate.

In the title phospho-rylated compound, C20H26Cl3N2O6P, the phthalimide unit is essentially planar (r.m.s. deviation = 0.0129 Å) and the O atoms of this unit deviate from the mean plane by 0.080 (3) and 0.041 (3) Å. In the crystal, pairs of mol-ecules are linked by N-H⋯O and weak C-H⋯O hydrogen bonds involving the same acceptor atom, forming inversion dimers. In addition, π-π stacking inter-actions between the phthalimide groups, with a centroid-centroid distance of 3.7736 (13) Å, and further weak C-H⋯O hydrogen bonds connect the inversion dimers into columns along [01].