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Thompson G K, Davis P L, Lee S K. "A Process for Preparing High-Purity 3-(2-Chlorophenyl)-5-[(E)-2-[(3,4-dimethylphenyl)amino]ethenyl]-1,2-oxazole-4-carbonitrile" [P]. US Patent, US 9659344 B2, 2022-03-22.
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