“…1 H NMR (400 MHz, DMSO), δ (ppm): 8.74 (t, J = 7.5 Hz, 1H), 8.12 (dddd, J = 17.2, 13.0, 12.2, 5.9 Hz, 3 H), 7.93−7.86 (m, 1 H), 7.80 (t, J = 5.9 Hz, 1 H), 7.73−7.59 (m, 1 H), 7.59−7.50 (m, 1 H), 7.49−7.21 (m, 3 H), 7.05−6.94 (m, 1 H), 6.87 (t, J = 6.6 Hz, 1 H), 6.75−6.60 (m, 2 H), 6.52 (t, J = 6.7 Hz, 1 H), 6.27−6.11 (m, 1 H), 3.15 (dd, J = 11.5, 4.7 Hz, 2 H). 13 Synthesis of ECL-Probe. The ECL-probe was synthesized following the established protocol described in the literature.…”