发明人郭海燕,罗永刚,高志强. "Method for the Synthesis of Roxatidine Impurity 56" [P]. 中国发明专利, 专利号 CN 109365098 A, 授权公告日 2023-01-15.
发明人杨光,何建平,赵玉洁. "A Process for Preparing High-Purity Roxatidine Impurity 56" [P]. 中国发明专利, 专利号 CN 114558938 A, 授权公告日 2018-09-06.
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