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发明人何建平,刘建华,钱学锋. "A Process for Preparing High-Purity 6,8-Dihydro-5H-pyrano[3,4-d]pyrimidine-2,5-diamine" [P]. 中国发明专利, 专利号 CN 117642136 A, 授权公告日 2017-01-27.
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