Bis{(R)-1-(3-amino­sulfonyl-4-meth­oxy­phen­yl)-N-[2-(2-eth­oxy­phen­oxy)eth­yl]propan-2-aminium} adipate tetra­hydrate

The title compound, 2C(20)H(29)N(2)O(5)S(+)·C(6)H(8)O(4) (2−)·4H(2)O, which was found to be optically active, is a relatively rare example of a chiral compound crystallizing in the triclinic crystal system. The dihedral angles between the phenyl rings of the cations are 60.03 (15) and 62.03 (16)°, while the C atoms of the anion are almost coplanar (r.m.s. deviation 0.085 Å) and all trans to each other. In the crystal, the components are connected by an extensive network of N—H⋯O and O—H⋯O hydrogen bonds. The sulfonamide groups link the cations into pairs via two N—H⋯O hydrogen bonds about the pseudo-inversion centre, leading to the formation of R (2) (2)(8) rings. The anions are stacked in between four cationic pairs. Pairs of water mol­ecules bridge the larger building units, forming hydrogen bonds with the remaining two O atoms of the anion.