What regulatory guidelines apply to 4,4'-Dimethoxybiphenyl (CAS: 2132-80-1)?

4,4'-Dimethoxybiphenyl (CAS: 2132-80-1) is regulated under the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) as a Category 3 skin sensitiser and a Category 1 carcinogen. It falls under the provisions of the REACH regulation in the European Union, which requires manufacturers and importers to register substances above a certain tonnage and provide safety data sheets. In the US, it is regulated by the EPA and may be subject to specific reporting and handling requirements, especially if used in large quantities.