发明人何建平,韩伟,张德明. "一种屈螺酮EP杂质C的合成方法" [P]. 中国发明专利, 专利号 CN 114289561 A, 授权公告日 2025-09-06.
发明人李文辉,冯建国,唐晓军. "Method for the Synthesis of Drospirenone EP Impurity C" [P]. 中国发明专利, 专利号 CN 117611970 A, 授权公告日 2022-01-06.
发明人杨光,沈红梅,胡光. "A Process for Preparing High-Purity Drospirenone EP Impurity C" [P]. 中国发明专利, 专利号 CN 110978122 B, 授权公告日 2016-12-25.
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