Novel bisabolane derivative from "arnica-da-serra" (Vernonieae: Asteraceae) reduces pro-nociceptive cytokines levels in LPS-stimulated rat macrophages - Pavarini, Daniel Petinatti; Nogueira, Elídia Fernandes; Callejon, Daniel Roberto; Soares, Denis Melo; Souza, Glória Emília Petto de; Cunha, Fernando de Queiroz; Lopes, Joao Luis Callegari; Lopes, Norberto Peporine (Journal of Ethnopharmacology, 2013)