A novel photo-oxidation product containing a six-membered 1,2-dioxane ring was isolated from the photolysis of indomethacin in methanol and a possible mechanism is proposed.
Wu, A. B., Cheng, H. W., Hu, C. M., Chen, F. A., Chou, T. C., & Chen, C. Y. (1997). Photolysis of indomethacin in methanol. Tetrahedron Letters, 38(4), 621–622. https://doi.org/10.1016/S0040-4039(96)02379-9