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A selective non-peptide agonist of the δ-opioid receptor (Ki = 0.18 nM, IC50 = 2.73 nM) that is over 2,000-fold less effective at the μ-opioid receptor; effectively activates µ/δ receptor heteromers (EC50 = 52.8 nM) but not κ/δ or μ/κ heteromers.