1 H NMR ( 300 MHz , DMSO - d 6 ) δ 0 . 85 - 0 . 92 ( 3 H , m ) , 1 . 17 - 1 . 31 ( 2 H , m ) , 1 . 67 - 1 . 84 ( 5 H , m ) , 1 . 97 - 2 . 10 ( 1 H , m ) , 3 . 25 - 3 . 30 ( 2 H , m ) , 3 . 43 - 3 . 59 ( 2 H , m ) , 3 . 77 - 3 . 91 ( 3 H , m ) , 4 . 14 ( 2 H , t , J = 7 . 0 Hz ) , 6 . 36 ( 1 H , d , J = 3 . 0 Hz ) , 6 . 96 ( 1 H , dd , J = 8 . 5 , 1 . 7 Hz ) , 7 . 30 - 7 . 41 ( 3 H , m ) .