We earlier determined the quantitative relationship between the antispasmodic activity, structure, and ZaCNMR spectra for series of benzhydrylureas [4]. In the development of these studies we synthesized 30 derivatives of arylmethylurea, determined their antispasmodic activity, and measured their chemical shifts in the IHNMR and 13CNMR spectra, and also carried out a search for a quantitative relationship between activity, ...