@article{nascimento_paula_david_david_2012,  title={Occurrence, biological activities and 13C NMR data of amides from Piper (Piperaceae)},  volume={35},  ISSN={0100-4042},  url={https://doi.org/10.1590/S0100-40422012001100037},  DOI={10.1590/S0100-40422012001100037},  number={11},  journal={Química Nova},  publisher={Sociedade Brasileira de Química},  author={Nascimento, Jeferson C. do and Paula, Vanderlúcia F. de and David, Jorge M. and David, Juceni P.},  year={2012},  pages={2288–2311} }