4-Amino-2-(3,4-diethoxyphenyl)-5H-[1]benzopyrano[4,3-d]pyrimidin-5-one

       ppm   Int.  Assign.

      166.11   382      1
      163.22   594      2
      160.86   376      3
      159.11   375      4
      153.44   773      5 *
      152.20   635      6 *
      148.16   711      7
      133.69   673      8
      129.53   576      9
      125.10   761     10 #
      124.76   735     11 #
      123.04   693     12
      118.19   592     13
      116.76   773     14
      114.69   486     15
      113.31   596     16
       94.82   470     17
       64.61   833     18 *1
       64.27   922     19 *1
       14.74  1000     20 #1
       14.57   982     21 #1