Materials studio to Gromacs conversion

I have been working on the adsorption of oil molecules on a solid surface. For this purpose I have to prepare a crystal slab (preferably in materials studio). I have generated the structure. But now I don’t know how can I convert this file (I have exported it into pdb) to generate all the forcefield parameters. I tried some online servers but they failed. Is there any script like msi2g96 for converting the materials studio input into gromacs topology?