The invention relates to an improved process for the preparation N-[4-[[4-(diethyl amino) phenyl] (2,5-disulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-N- ethylethanaminium inner salt sodium salt (Isosulfan blue) of formula I. The invention also relates to highly pure novel crystalline form of Isosulfan blue (I) hydrate and its process for the preparation thereof. The invention also relates to an improved process for the preparation of Isosulfan blue sodium hydrate having not more than 0.2% of desethyl impurity of formula A.
该发明涉及一种改进的制备N-[4-[[4-(
二乙基氨基)苯基](2,5-二磺苯基)亚甲基]-2,5-环
己二烯-1-基]-N-乙基乙酰胺内盐钠盐(异磺青)的方法,其
化学式为I。该发明还涉及异磺青(I)
水合物的高纯度新结晶形式及其制备方法。该发明还涉及一种改进的制备异磺青
钠水合物的方法,其不含超过0.2%的A式脱乙基杂质。