Phthalic anhydride (85-44-9) is an organic compound which is an anhydride of phthalic acid. This colorless solid is an important industrial chemical, especially for the large-scale production of plasticizers. Phthalic anhydride is a potent skin and respiratory tract sensitizer. Occupational exposure to phthalic anhydride may occur through dermal contact with this compound at workplaces in which it is produced or used.
Gad, S. C. (2014). Phthalic Anhydride. In Encyclopedia of Toxicology: Third Edition (pp. 934–936). Elsevier. https://doi.org/10.1016/B978-0-12-386454-3.01201-X