Setting up a system with Diatomic molecules

GROMACS version: 2020.2
GROMACS modification: No
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I want to set up a system which has diatomic molecules such as Nitrogen. I cannot generate the itp file for diatomic molecules using prodrg. How do I proceed with the first step, pdb2gmx. I am using the AMBERff99SB-ILDN force field for my study.


Thank you Justin!