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Oct 25 2021: Through DrugsData's expert network, we got a tentative identification of Fluoro-norfentanyl (CAS# 202859-51-6) for the unidentified substance with major ion 250.1 in this sample, presumably the para position since 4-fluoro fentanyl is also present. No reference standard is currently available for it in the U.S.
The unidentified substance with major ion 83 is likely N-(4-fluorophenyl)-N-(1-propionylpiperidin-4-yl)propionamide [the 'propionyl' fluoro-norfentanyl], which has no CAS#. There doesn't appear to be a certified reference standard for this, and this identification is unlikely to be confirmed until there is.
N-Phenethylpropanamide, 1-Phenethylpiperidin-4-ol, and 1-Phenethyl-4-propionyloxypiperidine also don't appear to be commercially available as certified reference standards at this time.