1 H NMR ( 300 MHz , DMSO - d 6 ) δ 1 . 66 - 1 . 83 ( 3 H , m ) , 1 . 92 - 2 . 09 ( 1 H , m ) , 2 . 29 ( 3 H , s ) , 3 . 24 - 3 . 28 ( 2 H , m ) , 3 . 38 - 3 . 56 ( 2 H , m ) , 3 . 69 - 3 . 88 ( 3 H , m ) , 6 . 75 - 7 . 00 ( 5 H , m ) , 7 . 13 - 7 . 32 ( 3 H , m ) .