1 H NMR ( 400 MHz , d 4 - MeOH ) δ 6 . 86 ( s , 2 H ) , 5 . 68 ( d , J = 80 . 4 Hz , 1 H ) , 3 . 13 ( d , J = 2 . 8 Hz , 2 H ) , 2 . 73 ( t , J = 7 . 8 Hz , 1 H ) , 2 . 55 - 2 . 41 ( m , 3 H ) , 2 . 29 - 2 . 14 ( m , 4 H ) , 1 . 88 - 1 . 76 ( m , 2 H ) , 1 . 29 ( s , 3 H ) , 0 . 95 - 0 . 81 ( m , 1 H ) , 0 . 52 - 0 . 15 ( m , 5 H )