Running this example requires that LAMMPS be built with the MSCG package and its fix mscg command. The fix uses the Multi-Scale Coarse-Graining (MS-CG) library, freely available at https://github.com/uchicago-voth/MSCG-release, to compute optimized coarse-grained force field parameters. The MS-CG library was developed by Jacob Wagner in Greg Voth's group at the University of Chicago.

See the lib/mscg/README file for instructions on how to download and install the MS-CG library for use with LAMMPS.