tert-Butyl [(4-fluoro-3-isopropoxyisoxazol-5-yl)meth-yl](phenyl-sulfon-yl)carbamate.

The title compound, C(18)H(23)FN(2)O(6)S, a new derivative of a fluoro-isoxazole containing sulfonamide functionality has been structurally characterized. The C-S-N-C(ipr) and C-S-N-C(carb) (ipr = 3-isopropoxyisoxazole, carb = carbamate) torsion angles are 111.1†(3)° and -70.0†(4)°, respectively. The sulfonamide functional group of this structure features S=O bond lengths of 1.403†(3) and 1.433†(3)†à , an S-N bond length of 1.672†(4)†à , and an S-C bond length of 1.753†(4)†à . The crystal packing features non-classical C-H⋯O hydrogen-bond inter-actions, with the carbonyl atom acting as a bifurcated acceptor, resulting in an R (1) (2)(8) ring.