We now ship a second extended parameter set for Metal-Organic Frameworks created by D.E. Coupry et al. (2016). Select the UFF4MOFII_general_db, UFF4MOFII_elements_db and UFF4MOFII_mmatomtypes_db files to use these parameters, and check that the proper atom types are detected for your system or set them manually. Please see  for details on the parameters.