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Thompson G K, Johnson M A, Fischer A B. "A Process for Preparing High-Purity Hexadecyl (4-chloro-3-((5-oxo-1-(2,4,6-trichlorophenyl)-4,5-dihydro-1H-pyrazol-3-yl)amino)phenyl)carbamate" [P]. US Patent, US 9505323 B2, 2015-11-21.
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