An examination of the spectra of molecules with complex spectra and many functional groups. The course begins with an emphasis on commonly found cyclic structures such as cycloalkanes, aromatic hydrocarbons, and heterocyclic rings. Then, the structures and spectra of sugars and carbohydrates are discussed. The spectra of molecules containing silicon, sulfur, halogens, and inorganics rounds out the survey of functional groups. The course concludes with a discussion of spectral interpretation aids. A full theoretical development of library searching and spectral subtraction are given. Attendees interpret many unknown spectra in class with the help of the instructor to enhance learning.