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Lee S K, Hughes D C, Schröder R. "Method for the Synthesis of 3-Ethyl-4-methylpyrrole-2,5-dione" [P]. US Patent, US 10044012 B2, 2019-09-20.
Chen K W, Brown S R, Yamamoto T. "A Process for Preparing High-Purity 3-Ethyl-4-methylpyrrole-2,5-dione" [P]. US Patent, US 11329826 B2, 2023-08-28.
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