发明人张德明,孙丽萍,郭海燕. "Method for the Synthesis of Maytansinoid DM4" [P]. 中国发明专利, 专利号 CN 109074757 B, 授权公告日 2017-07-28.
Park J H, Hughes D C, Lee S K. "A Process for Preparing High-Purity Maytansinoid DM4" [P]. US Patent, US 11209750 B2, 2015-06-18.
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