“…1 H-NMR (500 MHz, DMSO-d6, total scan = 80): 10.49 (s br, 2H, 2 × OH), 9.58 (m, 2H, 2 × H-1); 8.50 (m, 2H, Ar H-5, Ar H-5'); 7.90 (m, 2H, Ar H-9, Ar H-9'); 7.74 (m, 2H, Ar H-6, Ar H-6'); 7.55 (m, 2H, Ar H-8, Ar H-8'); 7.50 (m, 8H, Ar H-14, Ar H-14' , Ar-H-16, Ar H-16'); 7.35 (m, 8H, Ar H-13, Ar H-13' , Ar H-17, Ar H-17'); 6.95 (d, 2H, J 9.55 Hz, H-7, H-7'); 6.86 (d, 1H, J 7.65 Hz, Ar H-4); 6.47 (1H, d, J 8.6 Hz, H-4'); 4.86 (s br, 2H, 2 × NH-); 4.00 (s; 2H, -CH 2 ); 3.75 (s, 2H, -CH 2 ), 2.4 (buried) (s, 3H, CH 3 ). MS (EI); m/e (intensity): 1178 (3), 1147 (36), 1125 (23), 1076 (13), 998 (9), 947 (9), 906 (24), 815 (6), 729 (8), 671 (2), 611 (10), 555 (4), 481 (21), 424 (2), 389 (12), 336 (7), 291 (6), 249 (12), 176 (9), 58 (11), 33 (1). Molar conductance (Ω −1 cm 2 mol −1 ): 30, µ eff (B.M.…”