1 H NMR ( 400 MHz , CDCl 3 ) δ = 8 . 19 ( s , 1 H ) , 8 . 12 ( dd , J = 7 . 8 Hz , 1 . 9 Hz , 1 H ) , 8 . 10 ( s , 1 H ) , 8 . 02 ( d , J = 8 . 2 Hz , 1 H ) , 7 . 89 ( s , 1 H ) , 7 . 63 ( br d , J = 7 . 0 Hz , 1 H ) , 7 . 53 - 7 . 41 ( m , 10 H ) , 7 . 35 - 7 . 30 ( m , 2 H ) , 7 . 25 - 7 . 20 ( m , 4 H ) , 6 . 23 ( d , J = 17 . 6 Hz , 1 H ) , 6 . 14 ( d , J = 18 . 8 Hz , 1 H ) , 5 . 86 - 5 . 75 ( m , 1 H ) , 5 . 75 ( dt , J = 15 . 3 , 5 . 0 Hz , 1 H ) , 5 . 67 ( dt , J = 15 . 3 , 4 . 7 Hz , 1 H ) , 5 . 60 ( dd , J = 52 . 0 , 3 . 9 Hz . 1 H ) , 5 . 48 ( dd , J = 50 . 4 , 3 . 9 Hz . 1 H ) 5 . 50 - 5 . 39 ( m , 1 H ) , 4 . 91 - 4 . 64 ( m , 4 H ) , 4 . 57 - 4 . 25 ( m , 9 H ) , 4 . 15 ( d , J = 7 . 03 Hz , 1 H ) , 4 . 11 ( d , J = 7 . 03 Hz , 1 H ) .