Alkaloids from the leaves of annona crassiflora and their cytotoxic activity - Hidalgo, Miguel Peña; Furtado, Luciana Costa; Costa-Lotufo, Letícia Veras; Ferreira, Marcelo J. P; Santos, Deborah Yara Alves Cursino dos (Revista Brasileira de Farmacognosia = Brazilian Journal of Pharmacognosy, 2021)