1 H NMR ( 400 MHz , DMSO ) δ 8 . 33 ( d , J = 2 . 9 Hz , 1 H ) , 8 . 06 ( d , J = 3 . 1 Hz , 1 H ) , 7 . 88 ( dd , J = 14 . 9 , 2 . 9 Hz , 1 H ) , 7 . 58 ( ddd , J = 14 . 9 , 13 . 4 , 2 . 9 Hz , 3 H ) , 7 . 33 ( dd , J = 14 . 4 , 9 . 0 Hz , 2 H ) , 6 . 89 ( s , 2 H ) , 4 . 13 ( t , J = 14 . 6 Hz , 2 H ) , 3 . 54 ( s , 2 H ) , 3 . 26 ( s , 3 H ) , 3 . 01 ( t , J = 14 . 6 Hz , 2 H ) , 2 . 60 - 2 . 43 ( m , 4 H ) , 2 . 42 - 2 . 26 ( m , 4 H ) , 2 . 14 ( s , 3 H ) , 1 . 84 ( s , 1 H ) . LR - MS ( ESI ) m / z 601 ( M + 1 ) .