Abstract
The structure of the natural product N-methylserotonin is reported as its hydrogen oxalate salt. The solid-state structure of N-methylserotonin systematic name: [2-(5-hydroxy-1H-indol-3-yl)ethyl](methyl)azanium hydrogen oxalate, C11H15N2O+·C2HO4 −, is reported. The structure possesses a singly protonated N-methylserotonin cation and one hydrogen oxalate anion in the asymmetric unit. In the crystal, the molecules are linked by N—H⋯O and O—H⋯O hydrogen bonds into a three-dimensional network.