发明人黄志刚,唐晓军,孙丽萍. "Method for the Synthesis of 6-(Ethylsulfonyl)-2-(2-hydroxyethyl)-2H-1,4-benzoxazin-3(4H)-one" [P]. 中国发明专利, 专利号 CN 116118483 B, 授权公告日 2017-03-08.
发明人徐明华,何建平,冯建国. "A Process for Preparing High-Purity 6-(Ethylsulfonyl)-2-(2-hydroxyethyl)-2H-1,4-benzoxazin-3(4H)-one" [P]. 中国发明专利, 专利号 CN 112352637 A, 授权公告日 2015-11-20.
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