N-Desmethylclozapine is an active metabolite of Clozapine, an atypical antipsychotic drug used for the treatment of schizophrenia. Clozapine is sold under the trade names Clozaril and FrazaClo in the US. This Certified Snap-N-Spike Solution is suitable for use in urine drug testing, clinical toxicology, forensic analysis, and clinical monitoring by LC-MS/MS or GC/MS.