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. 2016 May 1;151:148–156. doi: 10.1016/j.talanta.2015.12.062

Fig. 1.

Fig. 1

Formation of methylpyridinium ether derivative of phenolic estrogens, showing an example of derivatization of an estrogen with 2-fluoro-1-methylpyridiniump-toluenesulfonate (FMP-TS) in the presence of triethylamine (TEA).