1 H NMR ( 700 MHz , DMSO - d 6 ) : δ 7 . 95 ( s , 1 H ) , 7 . 47 - 7 . 37 ( m , 2 H ) , 7 . 22 ( d , J = 8 . 6 Hz , 2 H ) , 7 . 17 ( t , J = 7 . 4 Hz , 1 H ) , 7 . 14 - 7 . 09 ( m , 4 H ) , 6 . 78 ( dd , J = 16 . 7 , 10 . 5 Hz , 1 H ) , 6 . 06 ( dd , J = 16 . 7 , 2 . 4 Hz , 1 H ) , 5 . 63 ( dd , J = 10 . 5 , 2 . 4 Hz , 1 H ) , 5 . 51 - 5 . 35 ( m , 3 H ) , 4 . 36 ( d , J = 13 . 0 Hz , 1 H ) , 4 . 00 ( d , J = 13 . 5 Hz , 1 H ) , 3 . 14 ( t , J = 6 . 6 Hz , 2 H ) , 2 . 97 ( t , J = 12 . 1 Hz , 1 H ) , 2 . 58 ( t , J = 11 . 6 Hz , 1 H ) , 1 . 88 - 1 . 79 ( m , 1 H ) , 1 . 61 ( t , J = 13 . 0 Hz , 2 H ) , 1 . 00 - 0 . 88 ( m , 2 H ) .