发明人郭海燕,韩伟,杨光. "Method for the Synthesis of Calcitriol Impurity 4" [P]. 中国发明专利, 专利号 CN 113044286 A, 授权公告日 2022-01-27.
发明人何建平,钱学锋,沈红梅. "A Process for Preparing High-Purity Calcitriol Impurity 4" [P]. 中国发明专利, 专利号 CN 116578186 A, 授权公告日 2020-10-13.
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