1 H NMR ( 300 MHz , DMSO - d 6 ) δ 1 . 20 ( 6 H , d , J = 7 . 2 Hz ) , 1 . 61 - 1 . 82 ( 3 H , m ) , 1 . 86 - 2 . 09 ( 1 H , m ) , 2 . 86 ( 1 H , quin , J = 6 . 9 Hz ) , 3 . 22 - 3 . 30 ( 2 H , m ) , 3 . 37 - 3 . 58 ( 2 H , m ) , 3 . 64 - 3 . 96 ( 3 H , m ) , 7 . 03 - 7 . 14 ( 2 H , m ) , 7 . 14 - 7 . 24 ( 2 H , m ) .