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The absolute configuration of strictosidinic acid, (2 S,3 R,4 S)-3-ethenyl-2-(β- d-glucopyranosyloxy)-4-{[(1 S)-2,3,4,9-tetrahydro-1 H-pyrido[3,4- b]indol-1-yl]methyl}-3,4-dihydro-2 H-pyran-5-carboxylate, was determined from its sodium chloride trihydrate, poly[[diaqua((2 S,3 R,4 S)-3-ethenyl-2-(β- d-glucopyranosyloxy)-4-{[(1 S)-2,3,4,9-tetrahydro-1 H-pyrido[3,4- b]indol-2-ium-1-yl]methyl}-3,4-dihydro-2 H-pyran-5-carboxylate)sodium] chloride monohydrate], {[Na(C26H32N2O9)(H2O)2]Cl·H2O} n. The strictosidinic acid molecule participates in intermolecular hydrogen bonds of the O-H...O and O-H...Cl types. The solid-state conformation was observed as a zwitterion, based on a charged pyridine N atom and a carboxylate group, the latter mediating the packing through coordination with the sodium cation. [ABSTRACT FROM AUTHOR]