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Schröder R, O'Brien P Q, Patel M V. "A Process for Preparing High-Purity 6,7-dimethyl-3,4-dihydro-1H-2-benzÂothiopyran-4-on-1-carboxyÂlic acid" [P]. US Patent, US 11605275 B2, 2024-12-22.
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