L-Histidyl-L-tyrosinium Dichloride Dihydrate, C₁₅H₂₀N₄O₄²⁺.2Cl^-.2H₂O

The His-Tyr dipeptide is doubly protonated. The positively charged side chain of the histidine residue is tightly coordinated by O and Cl^- hydrogen-bond acceptors. Both C-H groups of this side chain donate weak hydrogen bonds.

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