@article{wang2020using,
  title={Using HPLC to analyze (S)-oxiracetam and four related substances in the bulk drug of (S)-oxiracetam},
  author={Wang, Chao and Dong, Hong and Liu, Honghui and Sun, Zhaoyi and Yuan, Ahu and Wu, Jinhui and Hu, Yiqiao},
  journal={Journal of pharmaceutical and biomedical analysis},
  volume={180},
  pages={113072},
  year={2020},
  publisher={Elsevier}
}