Opioid receptor antagonist Ac-RFMWMK-NH2 Description This opioid receptor antagonist binds to the opioid receptor and inhibits the receptor's function. Specifications Product ID O6132 Product Name Opioid receptor antagonist Ac-RFMWMK-NH2 Formula Wt. 939.2 Purity ≥98% Store Temp +4oC