Mitsubishi Chemical Holdings is the largest chemical manufacturer in Japan. Subsidiary Mitsubishi Chemical Corporation produces a wide variety of petrochemicals, specialty chemicals, and the like. Another unit, Mitsubishi Plastics, manufactures plastics and films, data storage devices such as CDs and DVDs, as well as chemicals for semiconductor manufacturing. Mitsubishi Tanabe Pharma makes pharmaceutical products for central nervous system, cardiovascular, and gastrointestinal disorders, in addition to OTC and anti-inflammatory drugs. Mitsubishi Rayon as its fourth business unit.