[CAS Number 6104-71-8 (FB)] Norclozapine.hydrochloride, also known as N-Desmethylclozapine, is an active metabolite of the atypical antipsychotic clozapine. Norclozapine.HCl is a weak antagonist of DA D2 receptors and a strong inverse agonist of 5HT2a. Norclozapine is available as reference material (bulk powder and/or solution) and as calibrated, Ready-to-Use, certified reference material (CRM). This product is designed for use in qualitative and quantitative protocols and can be used for forensic, toxicology, research, and other chemical/biochemical analytical applications. Special storage & shipping requirements.