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Usage: obminimize [options] <filename> options: description: -c crit set convergence criteria (default=1e-6) -cg use conjugate gradients algorithm (default) -sd use steepest descent algorithm -newton use Newton2Num linesearch (default=Simple) -ff ffid select a forcefield: -h add hydrogen atoms -n steps specify the maximum numer of steps (default=2500) -cut use cut-off (default=don't use cut-off) -rvdw rvdw specify the VDW cut-off distance (default=6.0) -rele rele specify the Electrostatic cut-off distance (default=10.0) -pf freq specify the frequency to update the non-bonded pairs (default=10) GAFF General Amber Force Field (GAFF). Ghemical Ghemical force field. MMFF94 MMFF94 force field. MMFF94s MMFF94s force field. UFF Universal Force Field.