ZT 52656A is a selective kappa opioid agonist, used for the prevention or alleviation of pain in the eye. In Vitro ZT 52656A is a selective kappa opioid agonist, used for the prevention or alleviation of pain in the eye. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid IC50& Target:kappa opioid receptor