Reducing the original CSP landscape to the basin minima identified in the threshold simulations shows a significant reduction in the number of putative structures, yet the matches to both experimental forms are retained. The fact that the two experimental forms do not cluster together despite having the same hydrogen bonding motif is not unexpected. There is experimental evidence that the high-pressure form II has a degree of kinetic stability at lower pressures, suggesting the barrier between the forms is not negligible. This result is a good illustration of how basins with the same structural motif will not necessarily have a low energy pathway between them. The previous two systems were studied using rigid molecules on an energy surface calculated from an intermolecular potential. However, recently CSP has been exploring moving away from the rigid-body approximation in order to account for crystal structures of conformationally flexible molecules, which are especially significant for pharmaceuticals. To investigate these systems we have modified our original threshold algorithm implementation to allow for torsional moves and to use energy models that account for not only the intermolecular energy but also the intramolecular energy. With this in hand, we could investigate threshold clustering on a system involving conformationally flexible molecules, in this case resorcinol.