发明人沈红梅,杨光,何建平. "Method for the Synthesis of 5-Chloro-4-methyl-1H-pyrimido[4,5-d][1,3]oxazin-2(4H)-one" [P]. 中国发明专利, 专利号 CN 114989794 B, 授权公告日 2018-03-07.
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