'Unless otherwise noted, time is measured on a VAX Station 2000 under the single-task mode. bNumber of conformers having Boltzmann distributions larger than 0.01%. Parenthesized is the total number of conformers generated by the corner flapping calculation. CTime measured on a mainframe computer (HITAC M-682). flapping the corner atom to below the plane produces a different conformer, as we often practice with the ...