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Jørgensen K, Mueller T C, Schröder R. "Method for the Synthesis of (1S,3aR,6aS)-2-((R)-2-((R)-2-cyclohexyl-2-(pyrazine-2-carboxamido)acetamido)-3,3-dimethylbutanoyl)octahydrocyclopenta[c]pyrrole-1-carboxylic acid" [P]. European Patent, EP 3499379 A1, 2015-02-18.
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