# Residue 210 mapped to an entry

**URL:** <https://gromacs.bioexcel.eu/t/residue-210-mapped-to-an-entry/7423>\
**Category:** User discussions\
**Created:** [October 18, 2023, 4:07am UTC](https://gromacs.bioexcel.eu/t/residue-210-mapped-to-an-entry/7423 "2023-10-18T04:07:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ashkhan](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@ashkhan](https://gromacs.bioexcel.eu/u/ashkhan)\
**Post date:** [October 18, 2023, 4:07am UTC](https://gromacs.bioexcel.eu/t/residue-210-mapped-to-an-entry/7423/1 "2023-10-18T04:07:52Z")

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GROMACS version: 2022  
GROMACS modification: Yes/No  
Dear all,  
I am facing the error while running the command gmx pdb2gm  
Residue 210 named LYS of a molecule in the input file was mapped  
to an entry in the topology database, but the atom CG used in  
that entry is not found in the input file. Perhaps your atom  
and/or residue naming needs to be fixed.  
But at residue 210, there is no LYS, and ASN residue is found. I am not understanding why this is happening?