Affiliation: | (1) Department of Chemistry, Louisiana State University, 70803 Baton Rouge, Louisiana;(2) Department of Botany, Louisiana State University, 70803 Baton Rouge, Louisiana;(3) Department of Chemistry, Ashland University, 44805-3799 Ashland, Ohio;(4) Present address: Departamento de Química Orgánica, Universidad de Cadiz, 11510 Puerto Real (Cadiz), Spain |