Number of Estimated and Generated Conformations are Different

Dear MS Users,

I am trying to make a conformational search based on some dihedral rotations.

My molecule is attached as Molecule.bmp.

I allow the bonds to rotate the dihedral angles by 0, +2Pi/3, -2Pi/3 (Three Rotations).

I have 6 (Six) bonds of such kind in the central part of the molecule.

For six bonds, each having three torsional angles, there should be 729 states.

When I start the "Systematic grid Scan" in Conformers tool, it shows that the estimated conformations are 729.

(In torsions window, I fix the # of Steps=3 and so it has an interval of 120.)

But when it finishes the job successfully, it generates only 137 conformations.

I can’t find out what is going on here. Somebody please help me on this.

Thanks in Advance

Anant