1 H NMR ( 500 MHz , DMSO - d 6 ) δ 12 . 19 ( s , 2 H ) , 7 . 96 ( s , 1 H ) , 7 . 43 ( dd , J = 8 . 5 , 7 . 5 Hz , 2 H ) , 7 . 23 ( d , J = 8 . 6 Hz , 2 H ) , 7 . 18 ( t , J = 7 . 4 Hz , 1 H ) , 7 . 14 - 7 . 10 ( m , 4 H ) , 6 . 77 ( 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 . 46 - 5 . 39 ( m , 3 H ) , 4 . 36 ( d , J = 12 . 2 Hz , 1 H ) , 4 . 00 ( d , J = 13 . 1 Hz , 1 H ) , 3 . 15 ( t , J = 6 . 5 Hz , 2 H ) , 2 . 98 ( t , J = 12 . 3 Hz , 1 H ) , 2 . 58 ( t , J = 12 . 0 Hz , 1 H ) , 2 . 43 ( s , 5 H ) , 1 . 89 - 1 . 78 ( m , 1 H ) , 1 . 67 - 1 . 57 ( m , 2 H ) , 1 . 03 - 0 . 86 ( m , 2 H ) .