1 H NMR ( 300 MHz , DMSO - d 6 ) δ 0 . 95 ( 3 H , d , J = 6 . 4 Hz ) , 1 . 51 ( 1 H , q , J = 12 . 2 Hz ) , 1 . 82 - 2 . 19 ( 5 H , m ) , 3 . 13 - 3 . 26 ( 3 H , m ) , 3 . 36 - 3 . 48 ( 1 H , m ) , 3 . 69 - 3 . 88 ( 3 H , m ) , 6 . 97 ( 2 H , d , J = 8 . 3 Hz ) , 7 . 11 ( 1 H , d , J = 7 . 9 Hz ) , 7 . 17 - 7 . 26 ( 3 H , m ) , 7 . 33 ( 1 H , d , J = 7 . 5 Hz ) , 7 . 45 - 7 . 56 ( 1 H , m ) .