# Amber parmbsc1 + OL3

**URL:** <https://gromacs.bioexcel.eu/t/amber-parmbsc1-ol3/7003>\
**Category:** User discussions\
**Tags:** forcefield\
**Created:** [August 10, 2023, 12:34pm UTC](https://gromacs.bioexcel.eu/t/amber-parmbsc1-ol3/7003 "2023-08-10T12:34:39Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Pallavi.B](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@Pallavi.B](https://gromacs.bioexcel.eu/u/Pallavi.B)\
**Post date:** [August 10, 2023, 12:34pm UTC](https://gromacs.bioexcel.eu/t/amber-parmbsc1-ol3/7003/1 "2023-08-10T12:34:40Z")

</div>

GROMACS version:  
GROMACS modification: Yes/No  
Here post your question

Hi all,

Is there a gromacs force-field package containing the parmbsc1 force field for DNA and OL3 force field for RNA?

Best,  
Pallavi

---

<div class="post-metadata">

**Author:** ![satti](https://avatars.discourse-cdn.com/v4/letter/s/eb8c5e/32.png) [@satti](https://gromacs.bioexcel.eu/u/satti)\
**Post date:** [August 11, 2023, 8:30am UTC](https://gromacs.bioexcel.eu/t/amber-parmbsc1-ol3/7003/2 "2023-08-11T08:30:55Z")

</div>

Hello Pallavi,

Please check user contributions section

- [amber14sb\_parmbsc1.ff.tar.gz](https://ftp.gromacs.org/contrib/forcefields/amber14sb_parmbsc1.ff.tar.gz) and \* [amber14sb\_OL15.ff.tar.gz](https://ftp.gromacs.org/contrib/forcefields/amber14sb_OL15.ff.tar.gz)  
You need to combine them yourself.

best,  
Satyan