Mass spectrometry (ESI-) analysis confirmed the presence of desired [M-H] -ions in both products. While HPLC analysis seemed to show a mixture of diastereomers in a ratio of 80:20 for 2-F-L-lyxose-5-phosphate and 50:50 for 2-F-D-ribose-5-phosphate, the 1H NMR spectra showed a more complex mixture of products. The fluorine NMR analysis showed the expected four diastereomers (supplementary 11.3.4, 11.4.4), alongside multiple unknown fluorine peaks. These extra peaks may correspond to diastereomers at the 3' position or small amounts of fluorinated side products that were not eliminated during purification.