Introduction

The ready communication of structural information is fundamental to the development of chemistry. The most universally understood form of such information is the chemical structure diagram, such as that Uliutrated in Figure 1. However, it is frequently inconvenient to convey structural information directly (e.g., in conversation), so a number of other methods of representing chemical structures have been devdoped to satisfy a variety of needs. These methods include nomenclatures, notations, connection tables, adjacency matrices, molecular formulas, and fragment codes [1,2].