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发明人张德明,钱学锋,唐晓军. "A Process for Preparing High-Purity Ethyl 4-cyano-3-hydroxy-5-methylsulfanylthiophene-2-carboxylate" [P]. 中国发明专利, 专利号 CN 112481879 A, 授权公告日 2021-06-09.
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