The title molecular salt, C7H10N+ C4H5O5 , contains a 4-methylanilinium cation and a 3-carboxy-2-hydroxypropanoate (hydrogen 2-hydroxysuccinate) anion in the asymmetric unit. The cation is protonated at the amine N atom and the anion is deprotonated at one of the hydroxy O atoms of the carboxylic acid groups. An O—HO hydrogen bond in the anion generates an S(5) graph-set motif. An N—HO hydrogen bond links the anion and cation in the asymmetric unit. In the crystal, N—HO and O—HO hydrogen bonds link adjacent anions and cations, forming a two-dimensional network parallel to the ac plane and enclosing R2 3 (12), R2 3 (14) and R3 2 (10) ring motifs.
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