This classical textbook in the best sense of the word is now completely revised, updated and with more than 40 % new content. The approved ordering system according to the ring size of the heterocycles has been retained, while the important chapter on «Problems and their Solutions» has been almost completely renewed by introduction of up-to-date scientific exercises, resulting in a great tool for self-testing and exams. There was maintained a chapter on nomenclature and a helpful index of name...