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Brown S R, Stevens L M, Yamamoto T. "Method for the Synthesis of 4,4'-Diantipyrylmethane Monohydrate" [P]. US Patent, US 9838530 B2, 2022-05-27.
Björnsson E, Jørgensen K, Johansson L. "A Process for Preparing High-Purity 4,4'-Diantipyrylmethane Monohydrate" [P]. European Patent, EP 3381238 A1, 2020-11-25.
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