[gmx-users] PRODRG don't add hydrogen to sulphonate?

[freda]

hi 
  I am a graduate student in Zhe Jiang university.
  I  use the PRODRG to convert a small molecular contained the sulphonic acid,
but
the PRODRG won't add the hydrogen to the oxgen of sulphnate group, even if I
add the hydrogen to the oxgen,the PRODRG will delete it.
   I want to know the reason and expect somebody can help me solve this
problem
 tanks  
 





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