Johnson M A, O'Brien P Q, Mueller T. "Method for the Synthesis of 7-(tert-Butoxycarbonyl)-1-oxa-2,7-diazaspiro[4.4]non-2-ene-3-carboxylic acid" [P]. US Patent, US 9883879 B2, 2019-10-16.
发明人郭海燕,罗永刚,何建平. "A Process for Preparing High-Purity 7-(tert-Butoxycarbonyl)-1-oxa-2,7-diazaspiro[4.4]non-2-ene-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112313415 B, 授权公告日 2025-09-13.
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