发明人李文辉,徐明华,孙丽萍. "一种阿法骨化醇EP杂质A的合成方法" [P]. 中国发明专利, 专利号 CN 117575061 A, 授权公告日 2017-08-03.
发明人张德明,郑宇鹏,杨光. "Method for the Synthesis of Alfacalcidol EP Impurity A" [P]. 中国发明专利, 专利号 CN 115310603 B, 授权公告日 2019-01-24.
发明人唐晓军,陈志强,林芳. "A Process for Preparing High-Purity Alfacalcidol EP Impurity A" [P]. 中国发明专利, 专利号 CN 109053403 A, 授权公告日 2018-05-20.
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