title: dl-Tyrosinium chloride dihydrate.
abstract: In the title compound, C(9)H(12)NO(3) (+)·Cl(-)·2H(2)O, the cation has a protonated amino group resulting from proton transfer from chloridric acid. The structure displays double layers parallel to the [010] direction held together by N-H⋯O, N-H⋯Cl, O-H⋯O and O-H⋯Cl hydrogen bonds. These layers are stacked along the c axis at b = 1/2; within each layer, the tyrosinium cations are arranged in an alternating head-to-tail sequence, forming inversion dimers [R(2) (2)(10) motif]. The water mol-ecules allow for the construction of a three-dimensional hydrogen-bonded network formed by centrosymmetric R(6) (6)(28) and R(8) (8)(34) motifs.
authors.affiliation: Unité de Recherche Chimie de l'Environnement et Moleculaire Structurale, (CHEMS), Faculté des Sciences Exactes, Campus Chaabet Ersas, Université Mentouri de Constantine, 25000 Constantine,  Algeria.
authors.forename: Fatiha
authors.initials: F
authors.lastname: Guenifa
authors.forename: Lamia
authors.initials: L
authors.lastname: Bendjeddou
authors.forename: Aouatef
authors.initials: A
authors.lastname: Cherouana
authors.forename: Slimane
authors.initials: S
authors.lastname: Dahaoui
authors.forename: Claude
authors.initials: C
authors.lastname: Lecomte