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In the title compound, C9H12NO3+·Cl·2H2O, 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 [R22(10) motif]. The water mol­ecules allow for the construction of a three-dimensional hydrogen-bonded network formed by centrosymmetric R66(28) and R88(34) motifs.

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The title compound, 2C5H7N52+·2HSO4·SO42−, was synthesized from adenine and sulfuric acid. The asymmetric unit contains two diprotonated adeninium cations, two bis­ulfate anions and one sulfate anion. The crystal structure is stabilized by classical N—H...O and O—H...O hydrogen bonds, and weak C—H...O and C—H...N hydrogen bonds, generating a three-dimensional network.
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