Crystal structure of (-)-methyl (R,E)-4-[(2R,4R)-2-amino-2-tri-chloro-methyl-1,3-dioxolan-4-yl]-4-hy-droxy-2-methyl-but-2-enoate.

In the title compound, C10H14Cl3NO5, the five-membered dioxolane ring adopts an envelope conformation with the C atom bonded to the butenoate side chain as the flap. It deviates from the mean plane of the other atoms in the ring by 0.446 (6) Å. In the crystal, mol-ecules are connected by O-H⋯O hydrogen bonds into helical chains running along the b-axis direction. The chains are linked into a sheet structure parallel to (001) by an N-H⋯O hydrogen bond. These classical hydrogen bonds enclose an R44(24) graph-set motif in the sheet structure. Furthermore, a weak inter-molecular C-H⋯Cl inter-action expands the sheet structures into a three-dimensional network.