# Biphasic system energy minimization

**URL:** <https://gromacs.bioexcel.eu/t/biphasic-system-energy-minimization/8635>\
**Category:** User discussions\
**Created:** [March 18, 2024, 4:05am UTC](https://gromacs.bioexcel.eu/t/biphasic-system-energy-minimization/8635 "2024-03-18T04:05:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SP06](https://avatars.discourse-cdn.com/v4/letter/s/ecb155/32.png) [@SP06](https://gromacs.bioexcel.eu/u/SP06)\
**Post date:** [March 18, 2024, 4:05am UTC](https://gromacs.bioexcel.eu/t/biphasic-system-energy-minimization/8635/1 "2024-03-18T04:05:03Z")

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GROMACS version: 2021.4  
GROMACS modification: Yes/No  
Here post your question : I am preparing a biphasic system of water-cyclohexane. I got the cyclohexane pdb and itp files using charm gui. I am following the biphasic tutorial , where chx.top file is obtained using PRODRG. So I wanted to know how to get the chx.top file (if I am using any other forcefield like charmm36, OPLS or AMBER)? Can anyone please help me with this?