Examples of author, keyword, structure, and reaction searches related to the scientific achievements of A. Eschenmoser were analyzed to illustrate the power, but also the limitations of modern database systems like SciFinder, Reaxys, and Web of Knowledge. # Gratefully dedicated to Prof. Dr. Albert Eschenmoser on the occasion of his 85 th birthday. INTRODUCTION Since the early fifties of the last century, when Albert Eschenmoser started his scientific career, availability and accessibility of chemical information and thus chemical information retrieval have undergone the most dramatic and influential changes since the beginnings of chemistry. The literature of chemistry as a means to propagate research results was essential in shaping chemistry as a science. Quite early in its history, key elements of the information chain were started: scientific journals in 1665 (Philosophical Transactions of the Royal Society, London; Journal des Scavants, Paris), later journals devoted to chemistry (Crells Chemische Annalen 1778) as primary literature, handbooks (Gmelin Handbuch der theoretischen Chemie 1817), and the Pharmaceutisches Zentralblatt in 1830. These types of chemical information resources are still around today, but almost everything else has changed. In more than 30 years of searching databases, and about 25 years of teaching and supporting chemists to do their own searching, the author has learned that all too often users of electronic information sources are mislead by the now standard graphic user interfaces (GUIs) which are easy to use; chemists assume that the content of the underlying databases is likewise easy to utilize. This, unfortunately, is definitely not true. 1 The complexity of the database content reflects by necessity the complexity of chemistry itself, and this will not (and to a large extent cannot) be solved by user interfaces. Problems are not limited to