| http://www.w3.org/ns/prov#value | - An example of such a densification agent is an amine or amino acid (for example, a primary amine or an amino acid such as glycine) which forms six-membered rings by forming hydrogen bonds: A six-membered ring also is formed by the hydroxyl groups of carboxylic acids, alcohols, and amino acids, for example: A five membered ring can be formed by the densification agent and the functionality on the s
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