18-Methoxycoronaridine
18-MC is a α3β4 nicotinic antagonist and , in contrast to ibogaine , has no affinity at the α4β2 subtype nor at NMDA-channels nor at the serotonin transporter , and has significantly reduced affinity for sodium channels and for the σ receptor , but retains modest affinity for μ-opioid receptors where it acts as an agonist , and κ-opioid receptors . 
<triplet> α3β4 <subj> nicotinic antagonist <obj> subclass of