# Fatal error: Residue 'DLPS' not found in residue topology database

**URL:** <https://gromacs.bioexcel.eu/t/fatal-error-residue-dlps-not-found-in-residue-topology-database/6612>\
**Category:** User discussions\
**Created:** [June 15, 2023, 5:57pm UTC](https://gromacs.bioexcel.eu/t/fatal-error-residue-dlps-not-found-in-residue-topology-database/6612 "2023-06-15T17:57:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![carisa](https://avatars.discourse-cdn.com/v4/letter/c/6de8d8/32.png) [@carisa](https://gromacs.bioexcel.eu/u/carisa)\
**Post date:** [June 15, 2023, 5:57pm UTC](https://gromacs.bioexcel.eu/t/fatal-error-residue-dlps-not-found-in-residue-topology-database/6612/1 "2023-06-15T17:57:01Z")

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GROMACS version: version 2021.4-Ubuntu-2021.4-2  
Here post your question:  
Hello, i would like to know if anyone knows the force field necessary to create a topology of a calular membrane with lipid dlps and sapi33.  
thank you!