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, [C₁₂H₂₄NO₄][C₇H₇O₃S]·1.5H₂O, 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 ¹H and ¹³C NMR spectroscopic data are also presented.