Isolation, spectral characterization, molecular docking, and cytotoxic activity of alkaloids from Erythroxylum pungens O. E. Shulz - Macedo Pereira, G; Moreira, L GL; Neto, T DSN; Moreira de Almeida, W A; Almeida-Lima, J; Rocha, H AO; Barbosa, E G; Zuanazzi, J AS; de Almeida, M V; Grazul, R M; Navarro-Vázquez, A; Hallwass, F; Ferreira, L S; Fernandes-Pedrosa, M F; Giordani, R B (Phytochemistry, 2018)