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Reagents and conditions: (i) DIPEA, MeCN, 24%; (ii) EtOAc, HCI, 97%; (iii) 4-fluorophenethyl isocyanate, CHCI3, 80%; (iv) H2NNH2, DCM, ElOH, 42%; (v) CyAL-5, DSC, DMF, 24 h; 19, DMF, TEA, 48 h, 93%.
