[gmx-users] add. residue in topology database

[Daniele Veclani]

Dear users

I'm trying to build the topology files for a box with 1000 molecules of
water and an organic molecule.

when I use pdb2gmx come out the error: "OUB7 not found in residue topology
database"

how do I put this residue in the database?

I have a .itp file for this molecule.

I use gromacs 5.0.4.

Best regards.