@article{yang_zhao_liu_2011,  title={Synthesis and biological evaluation of novel conjugates of camptothecin and 5-flurouracil as cytotoxic agents},  volume={22},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532011000200017},  DOI={10.1590/S0103-50532011000200017},  number={2},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Yang, Liu and Zhao, Chun-Yan and Liu, Ying-Qian},  year={2011},  month={Feb},  pages={308–318} }