Scheme 2.
Synthesis of fluorescently labelled compounds 1, 2 and 11 and their schematic representation. Reagents and conditions: (a) NaAsc, CuSO4, MeOH—H2O (1:1), RT, 2 h; (b) NaAsc, CuSO4, MeOH, RT, 2 h.
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