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Johansson L, Rossi M, Sørensen M. "Method for the Synthesis of 2-Ethyl-3-methyl-1H-indole" [P]. European Patent, EP 3649918 A1, 2025-08-10.
Schröder R, Jørgensen K, Nowak P. "A Process for Preparing High-Purity 2-Ethyl-3-methyl-1H-indole" [P]. European Patent, EP 3639893 A1, 2016-05-17.
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