To a 20 mL scintillation vial was added the product from Example 28 (30 mg, 0.085 mmol), 2H-tetrazol-5-amine (8.00 mg, 0.088 mmol) and N,N-dimethylformamide (0.85 mL) followed by O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (39.0 mg, 0.102 mmol) and diisopropylethylamine (30 μL, 0.176 mmol). Following 4 hours of stirring, the solvent was evaporated and the residue purified over RP-HPLC to afford the title product. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.06-1.26 (m, 2 H), 1.43-1.57 (m, 2 H), 1.76-1.92 (m, 5 H), 2.36-2.41 (m, 2 H), 6.96-7.23 (m, 1 H), 7.23-7.46 (m, 2 H), 7.57-7.80 (m, 2 H), 11.99 (s, 1 H), 13.98 (s, 1 H), 15.83 (s, 1 H); MS (ESI) m/z 420 [M+H]+.
