# .rtp file generation

**URL:** <https://gromacs.bioexcel.eu/t/rtp-file-generation/7404>\
**Category:** User discussions\
**Tags:** pdb2gmx, forcefield, mdrun\
**Created:** [October 16, 2023, 10:45am UTC](https://gromacs.bioexcel.eu/t/rtp-file-generation/7404 "2023-10-16T10:45:14Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Khushi](https://avatars.discourse-cdn.com/v4/letter/k/5f8ce5/32.png) [@Khushi](https://gromacs.bioexcel.eu/u/Khushi)\
**Post date:** [October 16, 2023, 10:45am UTC](https://gromacs.bioexcel.eu/t/rtp-file-generation/7404/1 "2023-10-16T10:45:14Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question I need to add norleucine and D- norleucine to my .rtp file of the forcefield but I am unable to find parameters for the same