Find a low-energy conformation subject to restraints.
&cntrl
  ntx    = 1,       
  irest  = 0,      
  ntb    = 0,      
  igb    = 8,       
  gbsa   = 1,       
  cut    = 20,      
  ntr    = 0,     
  ntc    = 2,       
  ntf    = 2,      
  ntt    = 3,       
  temp0  =  10.0, !Low temperature: 10K   
  gamma_ln = 0.1, !Strong coupling to thermostat 
  ig     = -1,     
  nstlim = 200000,  
  dt = 0.005,       
  nscm = 100,         
  ntpr = 500, ntwx = 500, ntwr = 1000, 
  nmropt  = 1       !turn on restraints
/
&wt type='END'   /  !need this line
DISANG=_RESTRAINTS_FILE_ 
END