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Structures of valine 3,5-dinitrobenzyl ester (Val-DBE, 1), tyrosine 3,5-dinitrobenzyl ester (Tyr-DBE, 2), acetyl-lysine 3,5-dinitrobenzyl ester (AcK-DBE, 3), thioacetyl-lysine 3,5-dinitrobenzyl ester (ThioAcK-DBE, 4), and selenoacetyl-lysine 3,5-dinitrobenzyl ester (SeAcK-DBE, 5).
