http://www.w3.org/ns/prov#value | - onded together so as to form a disulfide ring; in structure III, XXX1, WWW4, ZZZ8, and BBB10 are as defined for structure I, YYY5 is a D- or L-aliphatic or aromatic amino acid, and AAA11 is a basic amino acid; and wherein E is a carboxylic acid or a peptidase-stable carboxylic acid derivative. 2.
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