| http://www.w3.org/ns/prov#value | - The compounds preferably include ??-amino acids such as glycine, alanine, valine, and glutamic acid; ??-amino acids such as ??-alanine; iminodiacetic acid, hydroxyethyliminodiacetic acid, hydroxyethylglycine, dihydroxyethylglycine, glycylglycine, N-methylglycine or the like.
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