Kumar R, Roberts E F, Schröder R. "一种左卡尼汀杂质N30(水中65%)的合成方法" [P]. US Patent, US 11000923 B2, 2018-01-25.
发明人郭海燕,朱建伟,赵玉洁. "Method for the Synthesis of Levocarnitine Impurity N30(65% in water)" [P]. 中国发明专利, 专利号 CN 115243133 A, 授权公告日 2025-02-25.
发明人冯建国,沈红梅,黄志刚. "A Process for Preparing High-Purity Levocarnitine Impurity N30(65% in water)" [P]. 中国发明专利, 专利号 CN 117425735 B, 授权公告日 2018-02-10.
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