Picraviane A and B: Nortriterpenes with limonoid-like skeletons containing a heptanolide E-ring system from Picramnia glazioviana

Leila Gimenes, Joao Marcos Batista Junior, Fernando Martins dos Santos Junior, Matheus da Silva Souza, Liany Luna-Dulcey, Javier Ellena, Marcia Regina Cominetti, Maria Fatima das Graças Fernandes da Silva, Paulo Cezar Vieira, Joao Bastita Fernandes, Dan Stærk