Crystal structure of (+)-methyl (E)-3-[(2S,4S,5R)-2-amino-5-hydroxymethyl-2-trichloromethyl-1,3-dioxolan-4-yl]-2-methylprop-2-enoate

In the title compound, C10H14Cl3NO5, the five-membered dioxolane ring adopts an envelope conformation. The C atom at the flap, which is bonded to the hydroxymethyl substituent, deviates from the mean plane of other ring atoms by 0.357 (5) angstrom. There are two intramolecular hydrogen bonds (O-H center dot center dot center dot N and N-H center dot center dot center dot O) between the hydroxy and amino groups, so that O- and N-bound H atoms involved in these hydrogen bonds are each disordered with equal occupancies of 0.50. The methyl 2-methylprop-2-enoate substituent also shows a disordered structure over two sets of sites with refined occupancies of 0.482 (5) and 0.518 (5). In the crystal, molecules are connected into a dimer by an O-H center dot center dot center dot O hydrogen bond. The dimers are further linked by N-H center dot center dot center dot O, C-H center dot center dot center dot N and C-H center dot center dot center dot O interactions, extending a sheet structure parallel to ((1) over bar 01).