@article{batista_garcía_castro_del corral_san feliciano_oliveira_2007,  title={New oxidized ent-kaurane and ent-norkaurane derivatives from kaurenoic acid},  volume={18},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532007000300020},  DOI={10.1590/S0103-50532007000300020},  number={3},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Batista, Ronan and García, Pablo A. and Castro, Maria A. and del Corral, José M. Miguel and San Feliciano, Arturo and Oliveira, Alaíde B. de},  year={2007},  pages={622–627} }