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发明人郑宇鹏,杨光,周伟. "A Process for Preparing High-Purity 3-Oxo-4-(1,3,3-trimethylindolin-2-ylidene)butanenitrile" [P]. 中国发明专利, 专利号 CN 112262449 B, 授权公告日 2018-12-22.
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