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Klinger H, Lee S K, Mueller T. "A Process for Preparing High-Purity 3-(1-Benzylpyrrolidin-3-yl) 5-methyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate" [P]. US Patent, US 11200465 B2, 2018-09-05.
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