1 H NMR ( DMSO - d 6 , 600 MHz ) , δ ( ppm ) : 4 . 43 ( 3 H , s ) , 5 . 26 ( 2 H , s ) , 7 . 24 ( 1 H , t , J = 7 . 2 Hz ) , 7 . 31 ( 2 H , t , J = 7 . 2 Hz ) , 7 . 38 ( 2 H , d , J = 7 . 2 Hz ) , 7 . 78 ( 2 H , d , J = 7 . 8 Hz ) , 7 . 82 ( 1 H , t , J = 7 . 2 Hz ) , 7 . 87 - 7 . 92 ( 3 H , m ) , 8 . 20 ( 1 H , d , J = 15 . 6 Hz ) , 8 . 27 ( 1 H , d , J = 8 . 4 Hz ) , 8 . 30 ( 3 H , d , J = 7 . 8 Hz ) , 8 . 36 ( 1 H , d , J = 16 . 2 Hz ) , 8 . 48 ( 1 H , d , J = 8 . 4 Hz ) , 8 . 57 ( 2 H , t , J = 8 . 4 Hz ) ;