@article{cheng_xie_zhang_cheng_du_wang_ying_kang_2012,  title={HPLC method for the simultaneous determination of four compounds in rat plasma after intravenous administration of Portulaca oleracea L. extract},  volume={48},  ISSN={1984-8250},  url={https://doi.org/10.1590/S1984-82502012000100018},  DOI={10.1590/S1984-82502012000100018},  number={1},  journal={Brazilian Journal of Pharmaceutical Sciences},  publisher={Universidade de São Paulo, Faculdade de Ciências Farmacêuticas},  author={Cheng, Zhongzhe and Xie, Ming and Zhang, Wenjie and Cheng, Lan and Du, Yang and Wang, Yunjiao and Ying, Xixiang and Kang, Tingguo},  year={2012},  month={Jan},  pages={163–170} }