20  ENERGY = 1.6  1
    1 C       0    2    0    1
    2 U       1    3    0    2
    3 C       2    4    0    3
    4 C       3    5    0    4
    5 A       4    6    0    5
    6 C       5    7    0    6
    7 C       6    8    0    7
    8 A       7    9    0    8
    9 U       8   10    0    9
   10 C       9   11   19   10
   11 C      10   12   18   11
   12 A      11   13    0   12
   13 C      12   14    0   13
   14 C      13   15    0   14
   15 C      14   16    0   15
   16 A      15   17    0   16
   17 G      16   18    0   17
   18 G      17   19   11   18
   19 G      18   20   10   19
   20 A      19    0    0   20