发明人刘建华,林芳,郭海燕. "Method for the Synthesis of 4-Cyano-5-(difluoromethoxy)pyridine-3-sulfonyl chloride" [P]. 中国发明专利, 专利号 CN 109545794 A, 授权公告日 2022-02-14.
发明人赵玉洁,钱学锋,林芳. "A Process for Preparing High-Purity 4-Cyano-5-(difluoromethoxy)pyridine-3-sulfonyl chloride" [P]. 中国发明专利, 专利号 CN 114574049 B, 授权公告日 2022-08-04.
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