发明人徐明华,钱学锋,林芳. "Method for the Synthesis of 2-Butyl-1'-methyl-1-oxo-1,4-dihydro-2h-spiro[isoquinoline-3,4'-piperidine]-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 110393820 B, 授权公告日 2019-06-26.
Anderson J P, Park J H, Johnson M A. "A Process for Preparing High-Purity 2-Butyl-1'-methyl-1-oxo-1,4-dihydro-2h-spiro[isoquinoline-3,4'-piperidine]-4-carboxylic acid" [P]. US Patent, US 10413355 B2, 2018-09-12.
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