发明人张德明,钱学锋,孙丽萍. "Method for the Synthesis of 7-tert-Butoxycarbonyl-2-oxa-7-azaspiro[3.4]octane-5-carboxylic acid potassium salt" [P]. 中国发明专利, 专利号 CN 116848139 A, 授权公告日 2018-12-14.
发明人陈志强,刘建华,杨光. "A Process for Preparing High-Purity 7-tert-Butoxycarbonyl-2-oxa-7-azaspiro[3.4]octane-5-carboxylic acid potassium salt" [P]. 中国发明专利, 专利号 CN 109952869 B, 授权公告日 2023-09-19.
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