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Williams B T, Klinger H, Hughes D C. "A Process for Preparing High-Purity 6-(5-(2-(1-Ethylquinolin-4(1H)-ylidene)ethylidene)-4-oxo-2-thioxothiazolidin-3-yl)hexanoic acid" [P]. US Patent, US 9576890 B2, 2021-11-07.
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