@article{carvalho_silva_rocha jr_2009,  title={A new derivative of dihydroochnaflavone isolated from Luxemburgia species (Ochnaceae) and the complete ¹H and 13C NMR chemical shifts assignments},  volume={19},  ISSN={0102-695X},  url={https://doi.org/10.1590/S0102-695X2009000100008},  DOI={10.1590/S0102-695X2009000100008},  number={1a},  journal={Revista Brasileira de Farmacognosia},  publisher={Sociedade Brasileira de Farmacognosia},  author={Carvalho, Mario G. de and Silva, Virginia C. and Rocha Jr, José G. da},  year={2009},  month={Jan},  pages={33–35} }