1 H NMR ( DMSO - d 6 , 400 MHz ) : δ ppm 12 . 13 ( s , 1 H ) , 10 . 13 ( s , 1 H ) , 8 . 21 ( s , 1 H ) , 8 . 12 ( d , J = 8 . 4 Hz , 1 H ) , 7 . 92 ( d , J = 8 . 8 Hz , 1 H ) , 7 . 82 ( d , J = 7 . 2 Hz , 1 H ) , 7 . 73 - 7 . 67 ( m , 2 H ) , 7 . 62 - 7 . 58 ( m , 1 H ) , 7 . 16 ( t , J = 54 . 4 Hz , 1 H ) , 6 . 60 ( d , J = 2 . 0 Hz , 1 H ) , 4 . 67 ( q , J = 6 . 8 Hz , 2 H ) , 1 . 44 ( t , J = 6 . 8 Hz , 3 H ) . ( ESI ) : m / z 383 . 0 [ M + H ] +.