Antimicrobial ent-pimarane diterpenes from Viguiera arenaria against Gram-positive bacteria - Porto, T S; Furtado, N AJC; Heleno, V CG; Martins, C HG; Da Costa, F B; Severiano, M E; Silva, N A; Veneziani, R SC; Ambrosio, S R (Fitoterapia, 2009)