20  ENERGY = 1.7  1
    1 C       0    2    0    1
    2 A       1    3    0    2
    3 C       2    4    0    3
    4 U       3    5    0    4
    5 C       4    6    0    5
    6 C       5    7    0    6
    7 A       6    8    0    7
    8 C       7    9    0    8
    9 C       8   10    0    9
   10 A       9   11    0   10
   11 U      10   12    0   11
   12 C      11   13    0   12
   13 C      12   14   19   13
   14 A      13   15    0   14
   15 C      14   16    0   15
   16 C      15   17    0   16
   17 C      16   18    0   17
   18 A      17   19    0   18
   19 G      18   20   13   19
   20 G      19    0    0   20