ChemInform Abstract: STUDIES ON POLYPEPTIDES. XLI. PROTON NMR STUDIES OF NON-COVALENT, SEMI-SYNTHETIC RIBONUCLEASE A ANALOGS IN WHICH HISTIDINE-119 HAS BEEN REPLACED BY L-HOMOHISTIDINE, Nτ-METHYL-L-HISTIDINE, NΠ-METHYL-L-HISTIDINE AND 3-(3-PYRAZOLYL)-L-AL

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