Lefèvre J P, Martínez F, Jørgensen K. "Method for the Synthesis of 1'-Tosylspiro[cyclohexane-1,3'-indoline]-5'-carboxylic acid" [P]. European Patent, EP 3689286 A1, 2021-01-12.
发明人张德明,朱建伟,高志强. "A Process for Preparing High-Purity 1'-Tosylspiro[cyclohexane-1,3'-indoline]-5'-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114336505 A, 授权公告日 2021-05-17.
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