1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 80 ( m , 4 H ) , 2 . 03 ( m , 4 H ) , 2 . 17 ( s , 3 H ) , 2 . 39 ( br t , 2 H J = 6 . 3 Hz ) , 2 . 48 ( m , 1 H ) , 2 . 94 ( m , 2 H ) , 4 . 41 ( br t , 2 H , J = 7 . 3 Hz ) , 6 . 99 ( m , 1 H ) , 7 . 06 ( m , 1 H ) , 7 . 25 - 7 . 36 ( m , 4 H ) , 7 . 45 ( m , 2 H ) , 7 . 59 ( m , 1 H ) , 7 . 63 ( br s , 1 H ) , 7 . 74 ( m , 1 H ) , 8 . 21 ( br s , 1 H ) ; MS ( m / e , M +): 442 ( M +), 413 , 231 , 70 .