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EST64454 maleate is a highly soluble σ1 receptor antagonist, demonstrating potent antinociceptive properties for pain treatment. EST64454 maleate exhibits excellent metabolic stability across various species and possesses an adequate pharmacokinetic profile in rodents. EST64454 maleate has been identified as a promising clinical candidate due to its favorable aqueous solubility and high permeability in Caco-2 cells.

[1] EST64454: a Highly Soluble σ1 Receptor Antagonist Clinical Candidate for Pain Management DOI:10.1021/acs.jmedchem.0c01575