In vitro metabolism of grandisin, a lignan with anti-chagasic activity - De Santis Ferreira, L; Callejon, D R; Engemann, A; Cramer, B; Humpf, H U; de Barros, V P; Assis, M D; da Silva, D B; de Albuquerque, S; Okano, L T; Kato, M J; Lopes, N P (Planta Med, 2012)