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The title compound, C18H30N4O12, exists as an unsymmetrical tri-zwitterion. The protonated N atoms form intramolecular hydrogen bonds to carboxylate O atoms. The molecules are linked by strong intermolecular hydrogen bonds formed by three COOH groups at one end of the mol­ecule and three carboxyl­ates at the negative ends of the two nearest neighbors [O...H 1.45 (3) Å]. The C—N bond lengths are clearly differentiated with respect to the charge on the N atom [C—N 1.459 (6), C—NH+ 1.502 (9) Å].

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, ttha

hkl

Structure factor file (CIF format)
Contains datablock fin04

CCDC reference: 129179

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