1 H NMR ( 300 MHz , DMSO - d 6 ) δ 0 . 78 ( 3 H , t , J = 7 . 4 Hz ) , 1 . 18 ( 3 H , d , J = 7 . 2 Hz ) , 1 . 54 ( 2 H , quin , J = 7 . 2 Hz ) , 1 . 62 - 1 . 81 ( 3 H , m ) , 1 . 87 - 2 . 11 ( 1 H , m ) , 2 . 50 - 2 . 67 ( 1 H , m ) , 3 . 15 - 3 . 36 ( 2 H , m ) , 3 . 37 - 3 . 56 ( 2 H , m ) , 3 . 66 - 3 . 98 ( 3 H , m ) , 7 . 03 - 7 . 22 ( 4 H , m ) .