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Characterization of the four designer benzodiazepines clonazolam, deschloroetizolam, flubromazolam, and meclonazepam, and identification of their in vitro metabolites.
The mass spectrum given in that paper almost exactly matches that in this sample, but not quite. Note the relative heights of the 203 and 249 mass peaks.
We are unable to confirm this result 100% until we can find a reference standard for clonazolam, but for now we're going to say this sample contains clonazolam.