Paliperidone-d4 is a deuterated compound of Paliperidone. Paliperidone has a CAS number of 144598-75-4. Paliperidone(Invega) is used as an atypical antipsychotic. It applies to the acute and maintenance treatment of schizophrenia. Chemically, paliperidone is the primary active metabolite of the older atypical antipsychotic risperidone.