H-His-His-OH TFA is an oligopeptide. H-His-His-OH TFA can chelate with Ruthenium (II). H-His-His-OH TFA inhibits the hydrolysis of metal ions at pH 7.4 [1].
References:
[1]. Bihari Z. Half-and full sandwich type Ru (II) complexes of histidine containing oligopeptides and their models: solution equilibrium studies and synthesis[J].
References:
[1]. Bihari Z. Half-and full sandwich type Ru (II) complexes of histidine containing oligopeptides and their models: solution equilibrium studies and synthesis[J].