C5H15NO4S2Si, M(r) = 245.4, monoclinic, P2(1), a = 7.746 (3), b = 11.965 (5), c = 12.538 (4) angstrom, beta = 91.86 (3)-degrees, V = 1161.4 (8) angstrom 3, Z = 4, D(x) = 1.403 Mg m-3, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 0.528 mm-1, F(000) = 520, T = 178 K, R = 0.031 for 4405 reflections. The two independent molecules in the asymmetric unit display no major differences. The N-Si bonds are long [1.850 (2), 1.853 (2) angstrom]. The geometry at nitrogen is essentially planar (the N atoms lie 0.03, 0.01 angstrom out of the plane of their three substituents).
