Table 2.

Association constants K_ass (M^–1) of Cd²⁺–ACAQ^a with antipodal Cys in different solvents.

ACN:HEPESb	guest	Kass (M–1)	enantioselectivity
8:2	D-Cys	(2.07 ± 0.37) × 105	KD/KL = 1.73
	L-Cys	(1.20 ± 0.30) × 105
5:5	D-Cys	(1.54 ± 0.09) × 104	KD/KL = 3.67
	L-Cys	(0.42 ± 0.12) × 104
1:99c	D-Cys	(2.78 ± 0.36) × 104	KD/KL = 3.35
	L-Cys	(0.83 ± 0.07) × 104

^aIn 5 µM; ^bHEPES in 10 mM at pH 7.4; ^cin 10 µM.