1-(1-(cyclooctylMethyl)-5-(hydroxyMethyl)-1,2,3,6-tetrahydropyridin-4-yl)-3-ethyl-1H-benzo[d]iMidazol-2(3H)-one hydrochloride

pKi: 8.65 (NOP receptor); 6.60 (μ-opioid receptor); 6.14 (κ-opioid receptor); < 5 (δ-opioid receptor)

Trap-101 hydrochloride (3, 30, and 300 nM) is inactive per se up to 10 μM, while in the range 3-300 nM, it produces a concentration dependent rightward shift of the concentration-response curve to N/OFQ without modifications of the maximal response to the agonist. Receptor binding affinities of Trap101 (pK _i values) at recombinant human NOP, and classical opioid receptors expressed in CHO cell membranes are 8.65, 6.60, 6.14 and < 5 for NOP, μ-, κ-, and δ-opioid receptors respectively.

Trap-101 hydrochloride (10-30 mg/kg; detected after 90 min) changes motor activity in naïve rats, it causes a delayed increase in the immobility time in the bar test at 30 mg/kg, Moreover, it increased stepping activity and rotarod performance at 10 mg/kg and reduces them at 30 mg/kg.6-OHDA lesioning produces motor asymmetry mostly affecting the contralateral paw and overall reduced motor performance. Trap-101 hydrochloride (intraperitoneal injection; 10-30 mg/kg; detected after 90 min) alleviates akinesia/bradykinesia and improves overall gait ability in hemiparkinsonian rats, being effective starting at 1 mg/kg and without worsening motor deficit at 30 mg/kg.