The common group frequencies and all strong bands are included for infrared and Raman spectroscopy. All bands, their molar absorption coefficients (when available), and the solvents are displayed for ultraviolet spectroscopy. For ¹H and ¹³CNMR the chemical shifts of recognizable groups, or a range for complex regions, and the solvents are listed. For mass spectra, the eight most abundant peaks, the parent peak (if not among the eight most abundant), and the relative intensities are displayed in order of decreasing intensity. In the Wiswesser Line Notation Index, the compounds have been cross-referenced by approximately 200 of the most common chemical classes and functional groups in the Chemical Structure and Substructure Index. This format allows rapid scanning of the significant structural feature in each compound. Volume I contains a composite alphabetical directory of both the IUPAC Compound and Common synonyms of the compounds. Structural diagrams and spectroscopic acids are included. -- AATA