What regulatory guidelines apply to 1,2,3-Benzotriazin-4(3H)-one (CAS: 90-16-4)?

1,2,3-Benzotriazin-4(3H)-one (CAS: 90-16-4) is subject to various regulatory guidelines. Under the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), it is classified as a toxic chemical. In the European Union, it is regulated under REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) and may require registration if the substance is produced or imported in quantities above one tonne per year. The U.S. Environmental Protection Agency (EPA) and the Food and Drug Administration (FDA) may also regulate its use based on specific applications such as pharmaceuticals or pesticides.