发明人黄志刚,陈志强,周伟. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 109437531 A, 授权公告日 2019-11-22.
Sørensen M, Johansson L, Schröder R. "Method for the Synthesis of 3-(3',3'-Dimethyl-6-nitrospiro[chromene-2,2'-indolin]-1'-yl)propanoic acid" [P]. European Patent, EP 3211335 A1, 2018-01-13.
发明人张德明,李文辉,马晓峰. "A Process for Preparing High-Purity 3-(3',3'-Dimethyl-6-nitrospiro[chromene-2,2'-indolin]-1'-yl)propanoic acid" [P]. 中国发明专利, 专利号 CN 116232366 B, 授权公告日 2025-11-13.
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