@article{chaves_roque_ayres_2004,  title={Steroids and flavonoids of Porcelia macrocarpa},  volume={15},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532004000400026},  DOI={10.1590/S0103-50532004000400026},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Chaves, Mariana H. and Roque, Nidia F. and Ayres, Mariane C. Costa},  year={2004},  month={Jul},  pages={608–613} }