Abstract
The crystal structure of (3,5-diamino-6-chloro-pyrazine-2-carbonyl)-guanidine picrate has been determined with the use of X-ray diffraction method. The crystals are triclinic, space group PI with a = 10.2980(4) A, b = 12.4322(4) A, c = 14.4310(5) A, α = 66.317(2)∘, β = 70.077(2)∘, γ = 72.462(2)∘, Z = 2. The asymmetric unit consists of one amiloride cation, picrate anion, and three DMSO molecules from the solvent, two of which are disordered. The molecules of amiloride and picrate are almost planar. The guanidine group of amiloride is protonated and makes a kind of a salt bridge with phenolate and forms hydrogen bonds with ortho-nitro oxygen atoms of picrate. The pairs of amiloride cation–picrate anion, transformed by the inversion center and translated by 2 a and c, are mutually parallel and are connected by molecules of DMSO. The conformation of amiloride picrate is compared with those in other crystal structures.
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