[gmx-users] how to create topology file for butane

[simon sangma]

Respected sir,                         I am working on GROMACS. I need your
help.I am trying to generate topology file for non-standard molecules like
butane, water. I am executing following command.


*pdb2gmx -f ALA.pdb -p ALA.top -o ALA.gro*
**
It is successfully working on amino acid residue.

But when i am executing it for butane.

*pdb2gmx -f BUTANE.pdb -p BUTANE.top -o BUTANE.gro*
**
**
Fatal error:
Residue 'DRG' not found in residue topology database


It is showing above errors.Please help me out on this.
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