Cytotoxic and anti-infective sesquiterpenes present in plagiochila disticha (Plagiochilaceae) and ambrosia peruviana (Asteraceae)

José C. Aponte, Han Yang, Abraham J. Vaisberg, Denis Castillo, Edith Málaga, Manuela Verástegui, Lavona K. Casson, Nicole Stivers, Paula J. Bates, Rosario Rojas, Irma Fernandez, Walter H. Lewis, César Sarasara, Michel Sauvain, Robert H. Gilman, Gerald B. Hammond