hz-2 hz-2 hz-2 is a drug which acts as a highly selective κ-opioid agonist. it is a potent analgesic with around the same potency as morphine, with a long duration of action and high oral bioavailability. side effects include sedation, nausea and dysphoria as well as diuretic effects. hz-2identifiers iupac name dimethyl 3,7-dimethyl-9-oxo-2,4-dipyridin-2-yl-3,7-diazabicyclononane-1,5-dicarboxylate cas number253304-60-8pubchem cid356604comptox dashboard (epa)dtxsid90326741 chemical and physical dataformulac23h26n4o5molar mass438.484 g·mol−13d model (jsmol)interactive image smiles n3ccccc3c(n1c)c2(c(=o)oc)cn(c)cc(c2=o)(c(=o)oc)c1c4ccccn4 (verify)