1 H - NMR ( 600 MHz , CDCl 3 ) δ ( ppm ) : 1 . 55 ( d , J = 7 Hz , 3 H ) , 1 . 69 ( m , 1 H ) , 1 . 82 ( m , 1 H ) , 2 . 32 ( s , 3 H ) , 2 . 76 ( m , 1 H ) , 2 . 82 ( m , 1 H ) , 2 . 94 ( m , 1 H ) , 3 . 24 ( m , 1 H ) , 3 . 86 ( s , 3 H ) , 6 . 23 ( q , J = 7 Hz , 1 H ) , 6 . 94 ( s , 1 H ) , 7 . 02 ( overlapped , 2 H ) , 7 . 04 ( overlapped , 1 H ) , 7 . 05 ( overlapped , 1 H ) , 7 . 25 ( d , J = 5 Hz , 1 H ) , 7 . 32 ( dd , J = 8 . 5 Hz , 2 H ) , 7 . 76 ( brs , 1 H ) , 7 . 89 ( brs , 1 H ) .