1 H - NMR : ( 300 MHz , DMSO - d 6 ) δ 12 . 11 ( broad singlet , 1 H ) , 11 . 41 ( s , 1 H ) , 9 . 87 ( s , 1 H ) , 8 . 21 ( s , 1 H ) , 7 . 41 ( dd , 1 H , J = 2 . 22 Hz ) , 7 . 29 ( m , 2 H , J = 2 . 34 Hz , 2 . 46 Hz , 7 . 47 Hz ) , 6 . 06 ( s , 1 H ) , 4 . 22 ( d , 2 H , J = 12 . 98 Hz ) , 3 . 59 ( m , 3 H ) , 2 . 88 ( t , 2 H , J = 12 . 51 Hz , 11 . 4 Hz ) , 2 . 40 ( s , 3 H ) , 2 . 24 ( s , 3 H ) , 2 . 17 ( d , 2 H , J = 6 . 87 Hz ) , 1 . 95 ( broad m , 1 H ) , 1 . 77 ( m , 5 H ) , 1 . 15 ( q , 2 H , J = 11 . 06 Hz , 12 . 09 Hz )