Isolation and structure elucidation of the main UV-A photoproducts of vandetanib

- Vandetanib undergoes UV-A photodegradation.
- Vandetanib photodegradation follows a zero-order kinetics.
- A photoproduct derives from a simple debromination (FP3).
- A photoproduct derives from a debromination followed by a solvent addition (FP2).