Asenapine-13C,d3 Maleate is the deuterium labeled and 13C-Asenapine Maleate (HY-11100). Asenapine (Org 5222) Maleate, an atypical antipsychotic, is an antagonist of serotonin receptors (pKi: 8.4-10.5), adrenoceptors (pKi: 8.9-9.5), dopamine receptors (pKi: 8.9-9.4) and histamine receptors (pKi: 8.2-9.0). Asenapine Maleate can be used in the research of schizophrenia and bipolar disorder[1][2].