[gmx-users] adding new lipid into /charmm27.ff/lipids.rtp

[Bing Bing]

Dear All,
Hi! I 'm using Charmm-gui to generate an empty membrane pdb and toppar, i
managed to get the charmm topology from toppar directory. With that, I'm
trying to put additional lipid topology from charmm-gui  into
/charmm27.ff/lipids.rtp (gromacs4.5.4) for my empty membrane. But with
pdb2gmx, it failed to recognize the residue type with the error "Residue not
found in residue topology database".
May i know in the rtp file format,  is the spacing crucial in order for
gromacs to process?

thank you in advance.


best regards,
bing
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