-----------------------------------------------------------------------------------------------------------
5                                     !number of fragments
-----------------------------------------------------------------------------------------------------------
No sites | fragment topology                               
---------|-------------------------------------------------------------------------------------------------
12        15 4  5  13 6  14 1  7  2  11 3  12
4         9  7  1  8
3         10 8  7
3         16 15 4
3         17 15 4 
-----------------------------------------------------------------------------------------------------------
2                                     !number of torsion groups
-----------------------------------------------------------------------------------------------------------
No torsions | atom list         
------------|----------------------------------------------------------------------------------------------
2           
10 8  7  9   -40.d0  +40.d0
 8 7  1  2   -30.d0  +30.d0
2
16 15 4  3   -50.d0  +50.d0
17 15 4 16   +90.d0 +180.d0