Connection table for BTR
  16  17  29
 N
 C
 C
 O
 O
 C
 C
 C
 N
 C
 C
 C
 C
 C
BR
 C
   1   2
   2   3
   2   6
   3   4
   3   5
   6   7
   7   8
   7  11
   8   9
   9  10
  10  11
  10  16
  11  12
  12  13
  13  14
  14  15
  14  16
   3   2   6   7 180.0   5.0
   6   7   8   9 180.0   5.0
  11   7   8   9   0.0   5.0
   6   7  11  10 180.0   5.0
   6   7  11  12   0.0   5.0
   8   7  11  10   0.0   5.0
   8   7  11  12 180.0   5.0
   7   8   9  10   0.0   5.0
   8   9  10  11   0.0   5.0
   8   9  10  16 180.0   5.0
   9  10  11   7   0.0   5.0
   9  10  11  12 180.0   5.0
  16  10  11   7 180.0   5.0
  16  10  11  12   0.0   5.0
   9  10  16  14 180.0   5.0
  11  10  16  14   0.0   5.0
   7  11  12  13 180.0   5.0
  10  11  12  13   0.0   5.0
  11  12  13  14   0.0   5.0
  12  13  14  15 180.0   5.0
  12  13  14  16   0.0   5.0
  13  14  16  10   0.0   5.0
  15  14  16  10 180.0   5.0
   2   1   3   6  35.0   5.0
   3   2   4   5   0.0   5.0
   7   6   8  11   0.0   5.0
  10   9  11  16   0.0   5.0
  11   7  10  12   0.0   5.0
  14  13  15  16   0.0   5.0