| http://www.w3.org/ns/prov#value | - The compounds (I) are prepared in a manner known per se, for example by addition of a primary amine R,-NH2 to an acrylic acid derivative: (X = carboxy, carboxylate or derivatised carboxy) (Addition of amines to a, p-unsaturated carbonyl compounds) to form a 8-amino acid deriva- tive: Which is acylated with a reactive, functional derivative of succinic acid, for example succinic anhydride or succin
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