... SP 8000 spectrophotometer; IR spectra with Unicam SP 2000 or Perkin–Elmer 298 spectro- photometers, NMR spectra on a Tesla BS 567A (1H at 100 MHz, 13C at 25.14 MHz), and Varian XL-200 (1H at 200 MHz), chemical shifts are ... (Vol. ... Bartl V., Dlabac A., Protiva M.: Collect. ...