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In the title chiral molecular salt, C4H12NO3S+·Cl−, the cation is protonated at the N atom, producing [RNH3]+, where R is CH3SO2OCH2C(H)CH3. The N atom in the cation is sp3-hybridized. In the crystal, cations and anions are connected by strong N—H...Cl hydrogen bonds to generate edge-shared 12-membered rings of the form {...Cl...HNH}3. This pattern of hydrogen bonding gives rise to zigzag supramolecular layers in the ab plane. The layers are connected into a three-dimensional architecture by C—H...O hydrogen bonds. The structure was refined as an inversion twin.