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U-47700 reaction with Marquis and Froehde reagent

U-47700 is a novel synthetic opioid, one of a very small number of non-fentanyl-derived opioids on the market. Testing with the marquis and froehde reagents both gave fizzing with no colour change on a sample of U-47700. You can see the rather uninteresting images below:

P1370766 P1370764


Note that the marquis reagent is off-clear but this does not represent a change from its starting colour.