1 H NMR ( 500 MHz , DMSO - d 6 ) 10 . 13 ( NH , br s , 1 H ) , 7 . 80 ( d , J = 8 . 5 Hz , 2 H ) , 7 . 62 ( d , J = 9 . 0 Hz , 2 H ) , 7 . 28 - 7 . 25 ( m , 2 H ) , 7 . 22 - 7 . 18 ( m , 2 H ) , 7 . 08 - 7 . 04 ( m , 4 H ) , 7 . 01 - 6 . 98 ( m , 1 H ) , 4 . 13 - 4 . 08 ( m , 1 H ) , 3 . 96 - 3 . 89 ( m , 1 H ) , 3 . 81 - 3 . 75 ( m , 2 H ) , 3 . 22 ( sep , J = 7 . 0 Hz , 1 H ) , 2 . 30 ( dd , J = 15 . 0 Hz , 5 . 0 Hz , 1 H ) , 2 . 18 ( dd , J = 15 . 0 Hz , 8 . 0 Hz , 1 H ) , 1 . 64 - 1 . 50 ( m , 2 H ) , 1 . 38 ( s , 9 H ) , 1 . 36 ( d , J = 7 . 0 Hz , 6 H ) , 1 . 36 - 1 . 30 ( m , 1 H ) , 1 . 31 ( s , 3 H ) , 1 . 16 ( s , 3 H ) , 0 . 93 ( q , J = 12 . 0 Hz , 1 H ) , MH - 698 .