发明人孙丽萍,陈志强,黄志刚. "Method for the Synthesis of 6'-(Ethyl(p-tolyl)amino)-3'-methyl-2'-(phenylamino)-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one" [P]. 中国发明专利, 专利号 CN 112996100 A, 授权公告日 2021-09-13.
发明人李文辉,徐明华,唐晓军. "A Process for Preparing High-Purity 6'-(Ethyl(p-tolyl)amino)-3'-methyl-2'-(phenylamino)-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one" [P]. 中国发明专利, 专利号 CN 115171375 A, 授权公告日 2021-03-08.
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