Table 1.

Binding affinity of opioid receptors of the tested compounds.

Compound	Ki [nM] ± SEM
	MOR	DOR	KOR
Dmt-DALDA	0.61 ± 0.02	2313	128.98 ± 8.02
KGOP01	0.12 ± 0.06	4.88 ± 0.11	72.75 ± 4.32
SBL-OPNK-4	1.02 ± 0.03	1251.18	90.50 ± 5.69
SBL-OPNK-5	2.11 ± 0.04	10.02 ± 3.20	90.72 ± 0.94
SBL-OPNK-6	74.93 ± 0.15	22377	100.44 ± 1.16
SBL-OPNK-7	2.83 ± 0.02	3.26 ± 0.09	52.98 ± 3.20
SBL-OPNK-8	119.68 ± 5.25	4574.17	103.83 ± 6.12
SBL-OPNK-9	5.43 ± 0.08	6.57 ± 4.02	97.15 ± 4.72