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Useful in tests for urea
Used in the protection of thiols as their S-xanthenyl (Xan) thioethers, by reaction in the presence of TFA. The Xan group can also be cleaved using TFA in dichloromethane in the presence of triethylsilane as a cation scavenger, or with iodine in acetic acid: J. Org. Chem., 62, 3841 (1997)./n