1 H NMR ( 400 MHz , DMSO ) δ 8 . 32 ( d , J = 2 . 9 Hz , 1 H ) , 8 . 05 ( d , J = 3 . 1 Hz , 1 H ) , 7 . 87 ( dd , J = 15 . 0 , 3 . 0 Hz , 1 H ) , 7 . 57 ( ddd , J = 14 . 9 , 13 . 4 , 3 . 0 Hz , 3 H ) , 7 . 32 ( dd , J = 17 . 7 , 8 . 9 Hz , 2 H ) , 6 . 88 ( s , 2 H ) , 4 . 30 ( td , J = 14 . 5 , 0 . 7 Hz , 2 H ) , 3 . 76 ( td , J = 14 . 6 , 0 . 8 Hz , 2 H ) , 3 . 53 ( s , 2 H ) , 3 . 40 ( s , 3 H ) , 2 . 59 - 2 . 43 ( m , 4 H ) , 2 . 43 - 2 . 25 ( m , 4 H ) , 2 . 19 ( s , 3 H ) . LR - MS ( ESI ) m / z 602 ( M + 1 ) .