1. SW Center for Natural Products Research and Commercialization, Office of Arid Lands Studies, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706-6800, United States, and Instituto de Química, Universidade Estadual Paulista, C.P. 355, 14801-970, Araraquara, SP, Brazil