“…Compound 1a: Pale yellow solid; 48.8 mg, 91%; mp > 300°C; 1 H NMR (400 MHz, CDCl 3 ) δ H = 9.38 (s, 2H), 8.67−8.69 (d, J = 7.28 Hz, 2H), J = 8.20 Hz,2H),7.93 (t,J = 7.78 Hz,2H) 8,20.4,30.1,40.3,121.1,123.9,125.0,126.8,126.9,128.0,129.5,131.1,133.8,142.1,163.6,163.7;MS (EI) m/z calcd for C 32 H 26 N 2 O 4 S 534.16,found 534.24. Anal.…”