Hughes D C, Anderson J P, Patel M V. "Method for the Synthesis of 6'-bromo-8'-chloro-1'H-spiro[cyclobutane-1,3'-imidazo[1,5-a]pyridine]-1',5'(2'H)-dione" [P]. US Patent, US 11390765 B2, 2023-12-04.
发明人孙丽萍,朱建伟,马晓峰. "A Process for Preparing High-Purity 6'-bromo-8'-chloro-1'H-spiro[cyclobutane-1,3'-imidazo[1,5-a]pyridine]-1',5'(2'H)-dione" [P]. 中国发明专利, 专利号 CN 113654198 A, 授权公告日 2021-03-10.
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