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发明人罗永刚,杨光,刘建华. "A Process for Preparing High-Purity Methyl 2'-amino-3'-cyano-6'-methyl-2-oxo-1-propylspiro[indoline-3,4'-pyran]-5'-carboxylate" [P]. 中国发明专利, 专利号 CN 109956697 A, 授权公告日 2019-03-16.
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