HRMS/MS Spectra of isotonitazene, metonitazene, and big metabolites identified in human hepatocyte incubates and reliable postmortem samples and suggested fragmentation styles. A5 and B3 are exactly the same metabolite; A6 and B4 are a similar metabolite Metonitazene is undoubtedly an analgesic drug connected to etonitazene, which was first described in https://chemicalglobe.com/product-tag/metonitazene-for-sale/