@article{takeara_jimenez_costa-lotufo_lopes_lopes_2007,  title={Sample optimization for rapid identification of nucleosides and bases from ascidian extracts using ESI-MS/MS},  volume={18},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532007000500027},  DOI={10.1590/S0103-50532007000500027},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Takeara, Renata and Jimenez, Paula C. and Costa-Lotufo, Letícia V. and Lopes, João L. C. and Lopes, Norberto P.},  year={2007},  pages={1054–1060} }