This
tool is useful for calculating Wiener index. This will predict Wiener Index of ligand/molecule. It is an important topological descriptor of a molecule. Wiener index can be further used for deducing various other properties of a ligand/molecule which can be useful in drug designing. Know more about Wiener Index.
Reference
1. O.Ivanciuc. Design of Topological Indices. Part 29. QSAR and QSPR Structural Descriptors from the Resistance Distance Matrix. Rev. Roum. Chim. 2002, 47, 675-686.