We have derived a detailed atomistic model for a-compound exhibiting t
ypical molecular features of ferroelectric liquid crystalline substanc
es. We show that common general purpose forcefields like CHARMm need t
o be improved in order to reach an acceptable degree of accuracy. A ge
nerally applicable route to derive forcefield parameters using ab init
io me;hods is introduced. First results of molecular dynamics simulati
ons of smectic phases are reported.