Abstract
The title compound, C15H18ClN5O2, crystallizes with two independent molecules (A and B) in the asymmetric unit. In both molecules, the isoxazolidine rings have an envelope conformation with the O atoms at the flap positions. Each molecule has three stereogenic centres with configurations 2(S), 3(S) and 4(R), confirmed by resonant scattering. Their conformations are significantly different, for example in molecule A the phenyl ring is inclined to the triazole ring by 32.5 (2)degrees, while in molecule B the corresponding dihedral angle is 10.7 (2)degrees. In the crystal, the A and B molecules are linked via an N-H center dot center dot center dot O and a C-H center dot center dot center dot O hydrogen bond. These units are linked by C-H center dot center dot center dot O and C-H center dot center dot center dot N hydrogen bonds, forming slabs parallel to the ab plane. There are C-H center dot center dot center dot pi interactions present within the slabs.