Using method C with 34 (150 mg, 0.15 mmol, 1.00 eq) and a 0–40% linear gradient of acetonitrile in TEAAc buffer 50 mM, pH 7 for purification, 14 (55 mg, 48%) was obtained as a white powder with 96% purity determined by HPLC analysis at 260 nm. 1H NMR (600 MHz, DMSO‑d 6) δ 8.33 (s, 1H), 8.32 (s, 1H), 8.150 (s, 1H), 8.147 (s, 1H), 7.75–7.68 (m, 2H), 7.53–7.49 (m, 2H), 7.35 (br. s, 2H), 7.28 (br. s, 2H), 5.95 (d, J = 5.5 Hz, 1H), 5.84 (d, J = 5.9 Hz, 1H), 5.52 (d, J = 6.1 Hz, 1H), 5.36 (m, 2H), 5.20 (d, J = 5.2 Hz, 1H), 4.74 (q, J = 5.6 Hz, 1H), 4.39 (t, J = 5.2 Hz, 1H), 4.29 (q, J = 4.7 Hz, 1H), 4.16 (q, J = 4.6 Hz, 1H), 4.11–4.05 (m, 1H), 3.93 (q, J = 3.6 Hz, 1H), 3.73–3.64 (m, 3H), 3.56–3.46 (m, 2H), 3.37–3.29 (m, 3H), 3.22 (dt, J = 14.7 Hz, 6.4 Hz, 1H). 13C NMR (150 MHz, DMSO‑d 6) δ 156.1, 156.0, 152.5, 152.5, 149.3, 148.9, 140.1, 139.5, 138.0, 137.7, 129.2, 128.7, 119.3, 119.3, 87.7, 86.2, 85.9, 82.1, 81.4, 72.2, 71.3, 69.9, 68.3, 61.1, 50.8, 47.7. HRMS (ESI+): m/z calcd for C28H33N11O9SCl [M+H]+: 734.1868, Found 734.1866.