4-(Acetylamino)-2-ethyl-1-methyl-5H-[1]benzopyrano[3,4-c]pyridin-5-one

       ppm   Int.  Assign.

      170.25   562      1
      166.99   393      2
      160.62   325      3
      151.42   543      4 *
      150.45   415      5 *
      142.35   233      6
      131.89   917      7
      128.70   878      8
      124.32   801      9
      120.85   346     10
      117.49   481     11
      117.15   746     12
      101.92   244     13
       29.31  1000     14
       25.61   759     15
       17.83   705     16
       11.94   861     17