Dear,
Can you give me the data file for epon 862 ?
sorry, but there is not *the* data file for any compound in LAMMPS.
its contents strongly depend on the force field that you want to
employ, and thus it is almost always the best approach to construct it
yourself, e.g. from a molecular editor (to get the geometry) and then
assign atom labels/types according to the force field and finally
output it. if you only need this for a specific case, you can easily
implement this in a scripting language like python (or matlab).
for more complex operations, there are also a variety if tools that
can be used in combination with LAMMPS. see
https://lammps.sandia.gov/prepost.html
axel.