1 H - NMR ( DMSO - d 6 ) ( δ ( ppm ) ) : 1 . 00 - 1 . 10 ( 12 H , m ) , 1 . 24 ( 4 H , s ) , 1 . 40 - 1 . 50 ( 2 H , m ) , 1 . 70 - 1 . 90 ( 2 H , m ) , 2 . 17 ( 2 H , t , J = 7 . 0 Hz ) , 2 . 26 ( 3 H , s ) , 2 . 64 ( 2 H , t , J = 6 . 5 Hz ) , 2 . 70 - 2 . 80 ( 1 H , m ) , 3 . 00 - 3 . 20 ( 4 H , m ) , 3 . 40 - 3 . 50 ( 3 H , m ) , 3 . 62 ( 1 H , d , J = 11 . 5 Hz ) , 3 . 93 ( 2 H , t , J = 6 . 0 Hz ) , 4 . 20 - 4 . 80 ( 1 H , br ) , 5 . 18 ( 1 H , d , J = 8 . 0 Hz ) , 6 . 60 ( 1 H , d , J = 8 . 0 Hz ) , 6 . 69 ( 2 H , s ) , 6 . 82 ( 1 H , d , J = 8 . 5 Hz ) , 7 . 47 ( 1 H , s )