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ESI-MS/MS identification of different benzoxazole products after nitro-to-amino reduction of FSAY(3-NO2)LER (10 µM) and tagging with 10 mM APPD and 100 µM K3Fe(CN)6. The structures shown in inserts contain different substitutions in position 6 of the original 3-NT ring (the fluorescent 2-phenylbenzoxasole core is circled).
