1 H NMR ( 400 MHz , DMSO - d 6 ) δ ppm 0 . 98 - 1 . 28 ( m , 15 H ) , 2 . 42 ( s , 5 H ) , 2 . 87 ( br s , 3 H ) , 3 . 57 - 3 . 62 ( m , 1 H ) , 3 . 70 - 3 . 86 ( m , 1 H ) , 4 . 02 - 4 . 14 ( m , 1 H ) , 4 . 20 ( s , 1 H ) , 4 . 24 - 4 . 51 ( m , 3 H ) , 4 . 70 - 4 . 88 ( m , 1 H ) , 5 . 69 - 5 . 86 ( m , 1 H ) , 6 . 04 ( br d , J = 19 . 33 Hz , 4 H ) , 7 . 12 - 7 . 27 ( m , 3 H ) , 7 . 27 - 7 . 44 ( m , 3 H ) , 7 . 81 ( s , 1 H ) , 11 . 95 - 12 . 58 ( m , 2 H )