THAP (purity 100%) and 2′,4′,6′-trihydroxybenzaldehyde (IS, purity 99.9%) were obtained from Sigma-Aldrich (St. Louis, MO, USA). Acetonitrile and methanol of high-performance liquid chromatography (HPLC)-grade were purchased from J.T. Baker (Phillipsburg, NJ, USA). An Aqua MAX™-Ultra (Young Lin Instrument, Gyeonggi-do, Korea) water purification system was used to distill water for HPLC analysis. All other chemicals and solvents used were of the highest analytical grades available.
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