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发明人郭海燕,罗永刚,赵玉洁. "A Process for Preparing High-Purity 21472-09-3
5,6-Dimethyl-1h-benzimidazol-7-amine dihydrochloride" [P]. 中国发明专利, 专利号 CN 109798617 A, 授权公告日 2021-11-24.
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