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Erimin-5 tablets containing benzodiazepine as an active ingredient are an abused illicit drug. Frequently, these tablets can be identified through physical observation by experienced analysts, and they are analysed by chromatography to determine their identities and impurities in forensic laboratories. Further analytical information on such Erimin-5 tablets would also certainly aid in forensic intelligence. Therefore, this study was aimed to investigate the Erimin-5 tablets for discrimination among street-level seizures. In this study, 90 seized Erimin-5 tablets from different cases were analysed using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy followed by chemometric procedures. ATR-FTIR profiles of seized samples were largely dominated by additives, either mannitol or lactose rather than its active ingredients, i.e. nimetazepam and diazepam. Principle component analysis revealed the formation of two main clusters, where cluster A consisted of seized samples cut with mannitol, while samples in cluster B could have contained lactose. Seized Erimin-5 tablets with these two different compositions might have originated from at least two different distribution chains based on their respective cutting agent. Such comparative information could aid in establishing the potential trafficking and distribution network, especially at the border of countries in South-East Asia.

Quick discrimination of seized Erimin-5 tablets by attenuated total reflectance-Fourier transform infra-red spectroscopy