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(i) Et3N, ethyl chloroformate, THF, r.t. overnight or (ii) HATU, DIEA, DCM, overnight; (iii) potassium thioacetate, acetone, r.t., 5 h; (iv) 2 M aq. NaOH solution, MeOH, r.t., 1.5 h or (v) AcCl, MeOH, r.t., 30–40 h.
