N,N,N-Trimethyl-N-(methyl 5-de­oxy-2,3-O-iso­propyl­idene-β-d-ribo­furan­osid-5-yl)ammonium 4-methyl­benzene­sulfonate sesquihydrate

The structure of the title compound, [C(12)H(24)NO(4)][C(7)H(7)O(3)S]·1.5H(2)O, contains alternating layers parallel to (001) of hydro­phobic and polar character, stabilized by C—H⋯O hydrogen bonding. The furan ring adopts an envelope conformation with the C(OMe) atom as the flap, and the dioxolane ring is twisted about one of the O—C(methine) bonds. A comparison to related compounds is presented. The tosyl­ate-O atoms were disordered over two positions with the major component having a site occupancy factor = 0.566 (12). The structure was refined as a rotary twin with regard to rotation about the c axis with the contribution of the second component being 0.0048 (6). Solvate water mol­ecules are highly disordered and were removed using the SQUEEZE procedure; the unit cell characteristics take into account the presence of the disordered solvent. High-resolution (1)H and (13)C NMR spectroscopic data are also presented.