发明人何建平,钱学锋,冯建国. "Method for the Synthesis of 2-Hydroxy-5,7-dimethyl-2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium chloride" [P]. 中国发明专利, 专利号 CN 117693739 A, 授权公告日 2015-11-26.
Nowak P, Sørensen M, Martínez F. "A Process for Preparing High-Purity 2-Hydroxy-5,7-dimethyl-2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium chloride" [P]. European Patent, EP 3960658 A1, 2016-12-26.
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