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Patel M V, Klinger H, Schröder R. "A Process for Preparing High-Purity Ethyl 6-oxo-2,3,4,6-tetrahydro-1H-pyrido[1,2-a]pyrimidine-9-carboxylate" [P]. US Patent, US 9977576 B2, 2018-09-03.
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