1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 72 - 2 . 04 ( m , 8 H ) , 2 . 19 ( s , 3 H ) , 2 . 28 ( t , 2 H , J = 6 . 3 Hz ) , 2 . 50 ( m , 1 H ) , 2 . 95 ( m , 2 H ) , 4 . 16 ( t , 2 H , J = 6 . 8 Hz ) , 4 . 47 ( s , 2 H ) , 6 . 96 ( m , 1 H ) , 7 . 22 - 7 . 30 ( m , 4 H ) , 7 . 37 ( m , 2 H ) , 7 . 49 ( br d , 1 H , J = 7 . 8 Hz ) , 7 . 57 ( m 1 H ) , 7 . 77 ( m , 1 H ) , 8 . 03 ( br s , 1 H ) , 8 . 51 ( dd , 1 H , J = 4 . 7 , 1 . 4 Hz ) , 8 . 68 ( m , 1 H ) ; MS ( m / e , M +): 467 ( M +), 375 , 245 .