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, forms an assembly of ionic components which are stabilized through a series of hydrogen bonds and chargeassisted intermolecular interactions. The title assembly crystallizes in the monoclinic C2/c space group with Z = 8. The asymmetric unit consists of a 4-(3-azaniumylpropyl)morpholin-4-ium dication, a hydrogen oxalate counter-anion and an inorganic chloride counter-anion. The organic cations and anions are connected through a network of N-HÁ Á ÁO, O-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds, forming several intermolecular rings that can be described by the graph-set notations (9). The 4-(3-azaniumylpropyl)morpholin-4-ium dications are interconnected through N-HÁ Á ÁO hydrogen bonds, forming C(9) chains that run diagonally along the ab face. Furthermore, the hydrogen oxalate anions are interconnected via O-HÁ Á ÁO hydrogen bonds, forming head-to-tail C(5) chains along the crystallographic b axis. The two types of chains are linked through additional N-HÁ Á ÁO and O-HÁ Á ÁO hydrogen bonds, and the hydrogen oxalate chains are sandwiched by the 4-(3-azaniumylpropyl)morpholin-4-ium chains, forming organic layers that are separated by the chloride anions. Finally, the layered three-dimensional structure is stabilized via intermolecular N-HÁ Á ÁCl and C-HÁ Á ÁCl interactions.