Isolation and antiradical evaluation of cinnamic acid derivatives from Baccharis regnelli (Asteraceae) - Eckert, Camila Rodrigues; Oliveira, Helena Maria R.; Ramos, Renato da Costa; Fávero, Oriana Aparecida; Lago, João Henrique Ghilardi; Romoff, Paulete; Baader, Wilhelm Josef (Brazilian Conference on Natural Products - BCNP, 2007)