The book tells about the structure of molecules of various organic compounds - dyes, odorous substances, repellents, attractants, rubbers and rubbers. The reader learns about the architecture of biopolymers, proteins and viruses, about changes in the hereditary code at the molecular level. The book is popular and illustrated with numerous drawings, molecular diagrams and models. Addressed to a wide range of readers interested in chemistry, teachers, university students, teachers and schoolchildren.