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Bautista E, Toscano A, Calzada F, Díaz E, Yépez-Mulia L, Ortega A.Bautista E, et al. Among authors: calzada f.J Nat Prod. 2013 Oct 25;76(10):1970-5. doi: 10.1021/np400606g. Epub 2013 Oct 7.J Nat Prod. 2013.PMID: 24099364