Elemental analyses were done by the Department of Medicinal Chemistry at the University of Kansas. Mass spectra were obtained on a Varian CH-5 mass spectrometer. Infrared spectra were obtained on a Beckman IR-8 (sodium chloride optics). Varian A-60 and T-60 spectrometers were used for determining NMR spectra of samples as solutions in chloroform- d containing an internal tetramethylsilane standard. An F&M Model 700 chromatograph ( ...
