Prepn: Hardy, Forster, US 2773903 (1956 to Am. Cyanamid). Reversed phase HPLC determn: L.-H. Wang, Chromatographia 50, 565 (1999). Clinical evaluation of skin protection efficacy: T. M. MacLeod, W. Frain-Bell, Br. J. Dermatol. 84, 266 (1971).
Ultraviolet screen.
Ultraviolet Screen