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The Graovac-Pisanski index, which is also called the modified Wiener index,was introduced in 1991 by A. Graovac and T. Pisanski. This variation of theclassical Wiener index takes into account the symmetries of a graph. In 2016 M.Ghorbani and S. Klav\v{z}ar calculated this index by using the cut method,which we generalize in this paper. Moreover, we prove that in some cases theautomorphism group of a zig-zag tubulene is isomorphic to the direct product ofa dihedral group and a cyclic group. Finally, the closed formulas for theGraovac-Pisanski index of zig-zag tubulenes are calculated.

The Graovac-Pisanski Index of Zig-Zag Tubulenes and the Generalized Cut Method