发明人陈志强,韩伟,胡光. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 116103906 A, 授权公告日 2022-08-10.
发明人马晓峰,张德明,林芳. "Method for the Synthesis of 1,3-bis(4-ethyl-3,5-dimethyl-1H-pyrrol-2-yl)-2,4-dihydroxy-Cyclobutenediylium bis(inner salt)" [P]. 中国发明专利, 专利号 CN 114619542 B, 授权公告日 2020-12-11.
发明人孙丽萍,朱建伟,沈红梅. "A Process for Preparing High-Purity 1,3-bis(4-ethyl-3,5-dimethyl-1H-pyrrol-2-yl)-2,4-dihydroxy-Cyclobutenediylium bis(inner salt)" [P]. 中国发明专利, 专利号 CN 110675893 A, 授权公告日 2019-09-16.
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