4-Methoxybenzenediazonium tetrafluoroborate

4-Methoxybenzenediazonium tetrafluoroborate (MBD) is a synthetic molecule that can be prepared by the reaction of sodium hydrogen with UV irradiation. MBD has been shown to have a pharmacokinetic profile similar to methyl cinnamate and is used in the treatment of hyperpigmentation, such as melasma and post-inflammatory hyperpigmentation. MBD interacts with the amino acid tyrosine at its 4-hydroxyl group, cleaving the C-O bond and forming an intramolecular hydrogen bond with the oxygen atom. This results in the formation of diazonium salt which reacts with tyrosinase and inhibits its activity.