Characterization of four unknown impurities in azithromycin and erythromycin imino ether using two‐dimensional liquid chromatography coupled to high‐resolution quadrupole time‐of‐flight mass spectrometry and nuclear magnetic resonance

2020 ◽  
Vol 34 (11) ◽  
Author(s):  
Yong Jin ◽  
Yu Xu ◽  
Jinjin Zhou ◽  
Zhikui Zhou ◽  
Jian Wang
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