[gmx-users] dealing with ATP

[Sajad Ahrari]

Dear users
i am working with a protein witch holds a hetero-atom in it's pdb structure. the 
hetero-atom  is named "d" and stands for "ADP+SO4" (in fact the third phosphate 
of ATP is being substituted with SO4). i wanted to know if gromacs holds a 
feature to change "d" into ATP? and if so do i need to introduce ATP for Gromacs 
or it is known for the program?
i do appreciate your help!
sajad
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