Affiliation: | (1) Dept. of Chemistry, University of South Dakota, Vermillion, S.D., U.S.A.;(2) The University of Iowa, Iowa City, Iowa, U.S.A.;(3) Institute of Agricultural Medicine and Environmental Health, 52319 Oakdale, IA, U.S.A.;(4) Dept. of Chemistry, University of Iowa, 52240 Iowa City, IA, U.S.A. |