发明人张德明,杨光,王建平. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 112766466 A, 授权公告日 2019-12-10.
发明人沈红梅,钱学锋,赵玉洁. "Method for the Synthesis of Sodium 4-((E)-2-((E)-3-(3,3-dimethyl-1-(4-sulfonatobutyl)-3H-indol-1-ium-2-yl)allylidene)-3,3-dimethylindolin-1-yl)butane-1-sulfonate" [P]. 中国发明专利, 专利号 CN 111886878 A, 授权公告日 2020-07-24.
发明人高志强,何建平,郑宇鹏. "A Process for Preparing High-Purity Sodium 4-((E)-2-((E)-3-(3,3-dimethyl-1-(4-sulfonatobutyl)-3H-indol-1-ium-2-yl)allylidene)-3,3-dimethylindolin-1-yl)butane-1-sulfonate" [P]. 中国发明专利, 专利号 CN 109296726 B, 授权公告日 2023-12-20.
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