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Mass spectra and product scans of the derivatized compounds: Glyoxylate was derivatized with both ethylhydroxylamine and MTBSTFA and glycolate and oxalate with MTBSTFA (both compounds did not react with ethylhydroxylamine). For glycolate and oxalate, isotopic labeled positions were lost during fragmentation, only peaks attributed to the derivatizing agent were present in the product scan.
