发明人何建平,杨光,郭海燕. "Method for the Synthesis of 3-((Z)-2-((Z)-2-(3-Methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4(5H)-ylidene)ethylidene)benzo[d]oxazol-3(2H)-yl)propanoic acid" [P]. 中国发明专利, 专利号 CN 110438282 A, 授权公告日 2016-10-22.
发明人张德明,冯建国,高志强. "A Process for Preparing High-Purity 3-((Z)-2-((Z)-2-(3-Methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4(5H)-ylidene)ethylidene)benzo[d]oxazol-3(2H)-yl)propanoic acid" [P]. 中国发明专利, 专利号 CN 117401794 B, 授权公告日 2020-06-26.
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