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Update May 13, 2014: The lab received a pure standard of modafinil and was able to confirm that this sample was pure modafinil.
The previously reported benzophenone that was detected by the lab had been created during the testing process and is not present in the original tablet.
Thanks to everyone, including the vendor, who helped get this issue resolved.
Benzophenone is a precursor chemical and could be a contaminant from an incomplete synthesis. Minor traces of other organic compounds were present but not identified. The lab's original view is that the Benzophenone is from an incomplete synthesis, but we have toned down that language. We have ordered the necessary lab standards to be able to better analyze modafinil [apr 2 2014], it will be a couple weeks before we get the samples and can re-run the analysis.
The lab notes: Modafinil degrades in the GC column and mass spectra match is base on degradation product of modafinil in the MS. Benzophenone and other minor trace organic compounds could be resultant of modafinil degradation products in the GC/MS.