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Rossi M, Mueller T C, Schröder R. "A Process for Preparing High-Purity 1-(2-(Diethylamino)ethyl)-3-hydroxy-4-(4-isopropoxy-3-methylbenzoyl)-5-(p-tolyl)-1H-pyrrol-2(5H)-one" [P]. European Patent, EP 3846515 A1, 2024-04-21.
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