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Sold as: Heroin
ID: 6306
Sold as: Heroin
Expected to be: Fentanyl, Carfentanil or other research chemical
Lab comments:
No Heroin.
White powder sample submitted from London, UK.
Regarding this result, István Ujváry comments, with schematic, 'The (likely) origin of the 1-phenethyl-4-propionyloxypiperidine contaminant: from reduction+acylation of unreacted starting material' (on Twitter, Dec 10 2018)

Thanks, Borax, for pointing this out!