GolP FF Access

GROMACS version:
GROMACS modification: Yes/No

I was wondering if anyone knew where to access the GolP FF described in this paper, GolP: an atomistic force-field to describe the interaction of proteins with Au(111) surfaces in water - PubMed.

I would like to use it to simulate biomolecules on a gold surface with gromacs.

Any help would be appreciated before I go ahead and email the corresponding author, thanks!

Josh