Table 1.

¹⁹F chemical shift tensor parameters of the compounds studied in this work. Chemical shift anisotropies are obtained from Herzfeld-Berger analysis⁶².

Compounds	Sites	δiso (ppm)	Δδ = δzz - δiso (ppm)	η
5F-Trp	5-19F	−122.1	53.7 ± 0.8	0.04 ± 0.08
PNC	FN	−113.4	−89.1 ± 2.2	0.52 ± 0.04
	FP	−118.9	−75.9 ± 0.9	0.42 ± 0.06
	FO	−104.8	77.2 ± 0.2	0.80 ± 0.06
Sitagliptin	FM	−137.8	−77.8 ± 2.7	0.51 ± 0.01
	FP	−147.1	−74.2 ± 1.6	0.47 ± 0.04
	FO	−116.0	−74.9 ± 1.0	0.78 ± 0.01
	CF3	−66.0	35.2 ± 2.3	0.03 ± 0.04
Formyl-MLF	FP	−116.1	58.0 ± 0.8	0.94 ± 0.02
	CF3	−38.9	19.3 ± 0.4	0.85 ± 0.03
GB1	3-19F-Y3	−133.3	−76 ± 3	0.4 ± 0.2
	3-19F-Y33	−135.9	−56.2 ± 0.7	0.2 ± 0.2
	3-19F-Y45	−132.9	−75 ± 1	0.4 ± 0.1