发明人林芳,杨光,马晓峰. "Method for the Synthesis of 6-Chloro-8-nitro-3,4-dihydro-2h-1-benzopyran-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109617230 B, 授权公告日 2022-12-05.
发明人刘建华,周伟,张德明. "A Process for Preparing High-Purity 6-Chloro-8-nitro-3,4-dihydro-2h-1-benzopyran-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 117161494 A, 授权公告日 2015-06-07.
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