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O'Brien P Q, Schröder R, Mueller T. "Method for the Synthesis of 1,4-Bis(butyryloxy)-2-butene" [P]. US Patent, US 9606265 B2, 2018-06-26.
Kumar R, Chen K W, Johnson M A. "A Process for Preparing High-Purity 1,4-Bis(butyryloxy)-2-butene" [P]. US Patent, US 11007389 B2, 2019-05-10.
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