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. Author manuscript; available in PMC: 2009 Jul 23.
Published in final edited form as: J Am Chem Soc. 2008 Jun 25;130(29):9268–9281. doi: 10.1021/ja801602q

Figure 1.

Figure 1

Isotopically labeled unnatural amino acids O-methyl-phenylalanine (OMePhe), its trifluorinated analog OCF3Phe and o-nitrobenzyl-tyrosine (oNBTyr) that is readily converted into tyrosine upon UV illumination.23