1 H NMR ( 300 MHz , CDCl 3 ) : 6 . 02 ( dd , J = 7 . 5 , 10 . 5 Hz , 1 H ) , 5 . 86 ( m , 2 H ) , 4 . 97 ( m , 3 H ) , 4 . 02 ( m , 2 H ) , 3 . 92 ( m , 2 H ) , 3 . 38 ( q , J = 9 . 6 Hz , 1 H ) , 3 . 21 ( t , J = 9 . 6 Hz , 1 H ) , 2 . 27 ( m , 2 H ) , 2 . 10 ( ddd , J = 1 . 8 , 3 . 0 , 11 . 1 Hz , 1 H ) , 1 . 90 ( td , J = 9 . 6 , 12 . 3 Hz , 1 H )