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A process for preparing impurity of esomeprazole
A process for preparing impurity of esomeprazole
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机译:一种埃索美拉唑杂质的制备方法
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摘要
The present invention relates to a process for preparing impurity of Esomeprazole or its pharmaceutically acceptable salt, for example, N-methyl esomeprazole of Formula IIa and IIb, which is useful as reference marker or a key intermediate to quantify its presence in Esomeprazole. Formula IIa Formula IIb
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