Table 3. Chemical Shift Changes, Δδ (ppm), at Saturation for Different Protons of Compounds R1–R3 Induced by OAc^–, in CD₃CN/DMSO-d₆ 9:1 (v/v) at 298 K^a.

R1		R2		R3
proton	Δδ (ppm)	proton	Δδ (ppm)	proton	Δδ (ppm)
H-20	0.25	H-21	0.21	H-19	0.28
H-11	2.63	H-11	3.56	H-10	3.08
H-9	2.89	H-9	3.62	H-8	3.09

^aΔδ = δ_Obs at saturation – δ of free receptor.