S1RA E-52862 or 4-(2-((5-methyl-1-(naphthalen-2-yl)-1H-pyrazol-3-yl)oxy)ethyl)morpholine is a selective sigma-1 receptor antagonist with a reported binding affinity of Ki = 17.0 ± 7.0 nM selective over the sigma-2 receptor and against a panel of other 170 receptors enzymes transporters and ion channels.
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