Hello, I do the energy minimization of the butylene box , but some 
butylene molecules are broken after that. The butylene itp file is 
produced by PRODRG, as follows:
 
[ moleculetype ]
; Name nrexcl
BUT      3
[ atoms ]
;   nr      type  resnr resid  
atom  cgnr   charge     mass
     1       
CH3     1  BUT      
C9     1    0.0049   
15.0350   
     2       
CH2     1  BUT      
C6     1   -0.02442  14.0270   
     3         
C     1  BUT      
C3     1    0.07957  
13.0190   
     4         
C     1  BUT      
C2     1   -0.06005  14.0270   
[ bonds ]
; ai  aj  fu    c0, c1, ...
   2   1   2    0.155   
7150000.0    0.155   7150000.0 ;    
C6   C9   
   2   3   2    0.153   
7150000.0    0.153   7150000.0 ;    
C6   C3   
   3   4   2    0.135   
7150000.0    0.135   7150000.0 ;    
C3   C2   
[ pairs ]
; ai  aj  fu    c0, c1, ...
   1   4   
1                                          
 ;    C9   C2   
[ angles ]
; ai  aj  ak  fu    c0, c1, ...
   1   2   3   2    
112.5       520.0    
112.5       520.0 ;    
C9   C6   C3   
   2   3   4   2    
125.0       610.0    
125.0       610.0 ;    
C6   C3   C2   
[ dihedrals ]
; ai  aj  ak  al  fu    c0, c1, m, ...
   1   2   3   4   
1      0.0    1.0 
6      0.0    1.0 6 ; 
dih    C9   C6   C3   C2 
 
Can  you show me why the butylene molecules would  be broken?
Thank you very much !
 
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