Characterization of Crystalline L-carnosine Zn(II) Complex (Z-103), a Novel Anti-gastric Ulcer Agent: Tautomeric Change of Imidazole Moiety upon Complexation. 
Chem. Pharm. Bull. 1990, 38, 2140–3146. DOI: 10.1248/cpb.38.3140
 
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