Unidentified substance appears to be a phenidate analogue (not methyl-, ethyl-, isopropyl- or propylphenidate, however). Best spectral match is methylphenidate but retention time is not a match.
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May 2020: There are four previously analyzed tablets that share similarities with this one... Sample 4132 (2016), Sample 3652 (2015), Sample 3337 (2014), and Sample 2540 (2012).