发明人徐明华,杨光,林芳. "Method for the Synthesis of (R)-Tert-Butyl-N-butanoate norlaudanosine oxalate" [P]. 中国发明专利, 专利号 CN 117533706 A, 授权公告日 2022-11-16.
Sørensen M, Mueller T C, Johansson L. "A Process for Preparing High-Purity (R)-Tert-Butyl-N-butanoate norlaudanosine oxalate" [P]. European Patent, EP 3474360 A1, 2022-10-07.
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