alanine-dipeptide-implicit.prmtop and alanine-dipeptide-implicit.inpcrd are
copied unchanged from OpenMM 8.2.0, wrappers/python/tests/systems, at
https://github.com/openmm/openmm/tree/8.2.0/wrappers/python/tests/systems,
under OpenMM's MIT License:

OpenMM was developed by Simbios, the NIH National Center for Physics-Based
Simulation of Biological Structures at Stanford, funded under the NIH Roadmap
for Medical Research, grant U54 GM072970. See https://simtk.org.

Portions copyright (c) 2008-2019 Stanford University and the Authors.

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