This textbook is for first and second-year university students majoring in chemistry, covering organic chemistry after completing high school chemistry in the Japanese curriculum. While maintaining the level of a university textbook, it carefully selects the essential content to be learned. It covers everything from the basics of chemistry to the nomenclature, structures, and characteristics of organic compounds, reaction mechanisms of formation and derivatives, and industrial production methods. Using the International System of Units (SI), it includes problems to aid understanding and provides concise and clear explanations to help grasp the key points. The cover has some minor scratches, but the inside is almost unused. There are no markings.